cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A Trapped Field of 17.6 T in Melt-Processed, Bulk Gd-Ba-Cu-O Reinforced with Shrink-Fit Steel
Creators: name: Durrell, John H.
name: Dennis, Anthony R.
name: Jaroszynski, Jan
name: Ainslie, Mark D.
name: Palmer, Kysen G. B.
name: Shi, Yunhua
name: Campbell, Archie M.
name: Hull, John
name: Strasik, Mike
name: Hellstrom, Eric
name: Cardwell, David A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The ability of large grain, REBa$_{2}$Cu$_{3}$O$_{7-δ}$ [(RE)BCO; RE = rare earth] bulk superconductors to trap magnetic field is determined by their critical current. With high trapped fields, however, bulk samples are subject to a relatively large Lorentz force, and their performance is limited primarily by their tensile strength. Consequently, sample reinforcement is the key to performance improvement in these technologically important materials. In this work, we report a trapped field of 17.6 T, the largest reported to date, in a stack of two, silver-doped GdBCO superconducting bulk samples, each of diameter 25 mm, fabricated by top-seeded melt growth (TSMG) and reinforced with shrink-fit stainless steel. This sample preparation technique has the advantage of being relatively straightforward and inexpensive to implement and offers the prospect of easy access to portable, high magnetic fields without any requirement for a sustaining current source.
description: Updated submission to reflect licence change to CC-BY. This is the "author accepted manuscript" and is identical in content to the published version
SEMIPARAMETRIC TRANSFORMATION MODELS WITH RANDOM EFFECTS FOR CLUSTERED FAILURE TIME DATA
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2008

description: We propose a general class of semiparametric transformation models with random effects to formulate the effects of possibly time-dependent covariates on clustered or correlated failure times. This class encompasses all commonly used transformation models, including proportional hazards and proportional odds models, and it accommodates a variety of random-effects distributions, particularly Gaussian distributions. We show that the nonparametric maximum likelihood estimators of the model parameters are consistent, asymptotically normal and asymptotically efficient. We develop the corresponding likelihood-based inference procedures. Simulation studies demonstrate that the proposed methods perform well in practical situations. An illustration with a well-known diabetic retinopathy study is provided.
D6.7 Monitoring Plan of the Digital Twin Instances
Creators: name: Galindo, Antoni
name: Ortega, Enric
name: Quintana, Antoni
name: Reyes, Guillermo
name: Borras, Mikel
name: Leão, Jorge
name: Porkka, Janne
name: Piira, Kalevi
Publisher: name: Zenodo
Year: 2023

description: This document explains the monitoring processes in the four pilots of the SPHERE project. It will also give an overview of which tools will be applied in each pilot. The document will focus on the tools that require data to be monitored. It will also go into detail on which variables (temperatures, consumptions, etc.) are going to be monitored, the frequency of the capture of these variables, and the equipment that is installed in the building in order to provide the values of these variables. Finally, is described the software, the gateways and the communication interfaces that allow all this information to be transmitted from the sensors and meters installed in the pilots to the Digital Twin Platform of IDP and VTT. These platforms will act as a repository of the captured variables. The tool providers will access these repositories to obtain the required information for the operation of their respective tools.
Statistical Modelling of Brain Morphological Measures Within Family Pedigrees
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2008

description: Large, family-based imaging studies can provide a better understanding of the interactions of environmental and genetic influences on brain structure and function. The interpretation of imaging data from large family studies, however, has been hindered by the paucity of well-developed statistical tools for that permit the analysis of complex imaging data together with behavioral and clinical data. In this paper, we propose to use two methods for these analyses. First, a variance components model along with score statistics is used to test linear hypotheses of unknown parameters, such as the associations of brain measures (e.g., cortical and subcortical surfaces) with their potential genetic determinants. Second, we develop a test procedure based on a resampling method to assess simultaneously the statistical significance of linear hypotheses across the entire brain. The value of these methods lies in their computational simplicity and in their applicability to a wide range of imaging data. Simulation studies show that our test procedure can accurately control the family-wise error rate. We apply our methods to the detection of statistical significance of gender-by-age interactions and of the effects of genetic variation on the thickness of the cerebral cortex in a family study of major depressive disorder.
title: Использование продуктов пчеловодства в апитерапии в условиях КФХ А. В. Лукьянова Новгородского района
Creators: name: Бондаренко, Людмила
Publisher: name: Новгородский государственный университет имени Ярослава Мудрого (НовГУ)
Year: 2022

description: Апитерапия – это лечение с помощью продуктов пчеловодства. Возрастающая популярность природных биологически активных веществ обусловлена их способностью влиять не на симптомы заболевания, а непосредственно на сам очаг заболевания, пусть и не сразу, но весьма действенно. В основном при лечении используют пчелиный яд, маточное молочко, прополис, пыльцу, пергу и другие продукты пчеловодства. В статье охарактеризованы методы апитерапии, которые применяются на пасеке крестьянского (фермерского) хозяйства А. В. Лукьянова. Большая популярность данных методов связана с постепенным переходом от искусственно синтезированных препаратов к лекарственным средствам, созданным на основе натуральных продуктов.
Продукция пчеловодства является биологически активными веществами, способными воздействовать на организм и влиять на физиологические и метаболические процессы в организме.
A GENERAL ASYMPTOTIC THEORY FOR MAXIMUM LIKELIHOOD ESTIMATION IN SEMIPARAMETRIC REGRESSION MODELS WITH CENSORED DATA
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010

description: We establish a general asymptotic theory for nonparametric maximum likelihood estimation in semiparametric regression models with right censored data. We identify a set of regularity conditions under which the nonparametric maximum likelihood estimators are consistent, asymptotically normal, and asymptotically efficient with a covariance matrix that can be consistently estimated by the inverse information matrix or the profile likelihood method. The general theory allows one to obtain the desired asymptotic properties of the nonparametric maximum likelihood estimators for any specific problem by verifying a set of conditions rather than by proving technical results from first principles. We demonstrate the usefulness of this powerful theory through a variety of examples.
The compatibility of additional symmetry and gauge transformations for the constrained discrete Kadomtsev-Petviashvili hierarchy
Creators: name: Li, Maohua
name: Cheng, Jipeng
name: He, Jingsong
Publisher: name: arXiv
Year: 2014
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: 35Q53, 37K10, 37K40

description: In this paper, the compatibility between the gauge transformations and the additional symmetry of the constrained discrete Kadomtsev-Petviashvili hierarchy is given, which preserving the form of the additional symmetry of the cdKP hierarchy, up to shifting of the corresponding additional flows by ordinary time flows.
description: 16 pages
VARIABLE SELECTION FOR REGRESSION MODELS WITH MISSING DATA
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010

description: We consider the variable selection problem for a class of statistical models with missing data, including missing covariate and/or response data. We investigate the smoothly clipped absolute deviation penalty (SCAD) and adaptive LASSO and propose a unified model selection and estimation procedure for use in the presence of missing data. We develop a computationally attractive algorithm for simultaneously optimizing the penalized likelihood function and estimating the penalty parameters. Particularly, we propose to use a model selection criterion, called the ICQ statistic, for selecting the penalty parameters. We show that the variable selection procedure based on ICQ automatically and consistently selects the important covariates and leads to efficient estimates with oracle properties. The methodology is very general and can be applied to numerous situations involving missing data, from covariates missing at random in arbitrary regression models to nonignorably missing longitudinal responses and/or covariates. Simulations are given to demonstrate the methodology and examine the finite sample performance of the variable selection procedures. Melanoma data from a cancer clinical trial is presented to illustrate the proposed methodology.
Semiparametric ROC Analysis Using Accelerated Regression Models
Creators: name: Zeng, Donglin
name: Kim, Eunhee
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2013

description: The Receiver Operating Characteristic (ROC) curve is a widely used measure to assess the diagnostic accuracy of biomarkers for diseases. Biomarker tests can be affected by subject characteristics, the experience of testers, or the environment in which tests are carried out, so it is important to understand and determine the conditions for evaluating biomarkers. In this paper, we focus on assessing the effects of covariates on the performance of the ROC curves. In particular, we develop an accelerated ROC model by assuming that the effect of covariates relates to rescaling a baseline ROC curve. The proposed model generalizes the accelerated failure time model in the survival context to ROC analysis. An innovative method is developed to construct estimation and inference for model parameters. The obtained parameter estimators are shown to be asymptotically normal. We demonstrate the proposed method via a number of simulation studies, and apply it to analyze data from a prostate cancer study.
Topological tuning in three-dimensional Dirac semimetals
Creators: name: Narayan, Awadhesh
name: Di Sante, Domenico
name: Picozzi, Silvia
name: Sanvito, Stefano
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study with first-principles methods the interplay between bulk and surface Dirac fermions in three dimensional Dirac semimetals. By combining density functional theory with the coherent potential approximation, we reveal a topological phase transition in Na$_3$Bi$_{1-x}$Sb$_{x}$ and Cd$_3$[As$_{1-x}$P$_x$]$_2$ alloys, where the material goes from a Dirac semimetal to a trivial insulator upon changing Sb or P concentrations. Tuning the composition allows us to engineer the position of the bulk Dirac points in reciprocal space. Interestingly, the phase transition coincides with the reversal of the band ordering between the conduction and valence bands.
description: Updated text, published version
9 Briefe, 1 Beilage an [Johann Caspar] Lavater
Brief an Lavater ...
Creators: name: Post, Liborius Dietrich von
Publisher: name: [s.n.]
Year: 1786

description: von L[iborius] D[ietrich von] Post
description: Davon 1 Brief undatiert (Nr. 331)
description: Beilage: Text über Wohltätigkeit und wohltätige Einrichtungen in Bremen (in Nr. 333)
Bayesian sensitivity analysis of statistical models with missing data
Creators: name: Zhu, Hongtu
name: G Ibrahim, Joseph
name: Tang, Niansheng
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2014

description: Methods for handling missing data depend strongly on the mechanism that generated the missing values, such as missing completely at random (MCAR) or missing at random (MAR), as well as other distributional and modeling assumptions at various stages. It is well known that the resulting estimates and tests may be sensitive to these assumptions as well as to outlying observations. In this paper, we introduce various perturbations to modeling assumptions and individual observations, and then develop a formal sensitivity analysis to assess these perturbations in the Bayesian analysis of statistical models with missing data. We develop a geometric framework, called the Bayesian perturbation manifold, to characterize the intrinsic structure of these perturbations. We propose several intrinsic influence measures to perform sensitivity analysis and quantify the effect of various perturbations to statistical models. We use the proposed sensitivity analysis procedure to systematically investigate the tenability of the non-ignorable missing at random (NMAR) assumption. Simulation studies are conducted to evaluate our methods, and a dataset is analyzed to illustrate the use of our diagnostic measures.
44 Briefe an J[ohann] K[aspar] Lavater
Brief an Lavater ...
Creators: name: Post, Meta
Publisher: name: [s.n.]
Year: 1790

description: von Meta Post
description: Davon 2 Briefe ohne Jahr (Nr. 288 und 289); Brief Nr. 302 auf erster Seite versehentlich auf September statt November datiert (IX statt XI); 1 Brief ohne Jahr, Jahr aufgrund Wochentag identifizierbar (Nr. 307)
description: Davon 2 Briefe von Meta Post an Katharina Kramer, dat. 28.6.1797 und 14.1.1799 (Nr. 313 und Nr. 320a) und 1 Brief von Meta Post an Frau G. H., dat. Bremen, 13.1.1799 (Nr. 320)
description: Mit Auszug aus einem Brief von Johann Jakob Stolz (in Nr. 295); mit Abschrift eines Briefes von Christine Merrem (in Nr. 299); mit Auszügen aus einer Art Tagebuch zur Aufzeichnung von Gotteserfahrungen (in Nr. 302)
description: Davon 1 Brief mit Auflistung der Freundinnen und Freunde von Post mitsamt Geburtstagen (Nr. 314) sowie 1 Brief mit Liste "Lavaters Freunde in Bremen" (Nr. 328)
The distribution of satellites around massive galaxies at 1
Creators: name: Kawinwanichakij, Lalitwadee
name: Papovich, Casey
name: Quadri, Ryan F.
name: Tran, Kim-Vy H.
name: Spitler, Lee R.
name: Kacprzak, Glenn G.
name: Labbe, Ivo
name: Straatman, Caroline M. S.
name: Glazebrook, Karl
name: Allen, Rebecca
name: Cowley, Michael
name: Davé, Romeel
name: Dekel, Avishai
name: Ferguson, Henry C.
name: Hartley, W. G
name: Koekemoer, Anton M.
name: Koo, David C.
name: Lu, Yu
name: Mehrtens, Nicola
name: Nanayakkara, Themiya
name: Persson, S. Eric
name: Rees, Glen
name: Salmon, Brett
name: Tilvi, Vithal
name: Tomczak, Adam R.
name: van Dokkum, Pieter
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the statistical distribution of satellites around star-forming and quiescent central galaxies at 19$ at z<3. The radial satellite distribution around centrals is consistent with a projected NFW profile. Massive quiescent centrals, $\log(M/M_\odot)>10.78$, have $\sim$2 times the number of satellites compared to star-forming centrals with a significance of 2.7$σ$ even after accounting for differences in the centrals' stellar-mass distributions. We find no statistical difference in the satellite distributions of intermediate-mass quiescent and star-forming centrals, $10.48
description: 19 pages, 17 figures, accepted by ApJ. Information on ZFOURGE can be found at http://zfourge.tamu.edu
Empirical likelihood for estimating equations with nonignorably missing data
Creators: name: Tang, Niansheng
name: Zhu, Hongtu
name: Zhao, Puying
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2014

description: We develop an empirical likelihood (EL) inference on parameters in generalized estimating equations with nonignorably missing response data. We consider an exponential tilting model for the nonignorably missing mechanism, and propose modified estimating equations by imputing missing data through a kernel regression method. We establish some asymptotic properties of the EL estimators of the unknown parameters under different scenarios. With the use of auxiliary information, the EL estimators are statistically more efficient. Simulation studies are used to assess the finite sample performance of our proposed EL estimators. We apply our EL estimators to investigate a data set on earnings obtained from the New York Social Indicators Survey.
Influence of ICTs on workforce productivity in Egyptian industrial organizations
Creators: name: Elsaadani, Mohamed
Publisher: name: arXiv
Year: 2014
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Present study aims to investigate the influence of ICTs dimensions: Information Technology, Management Information System, Office automation, Intranet and Internet on workforce productivity for a group of industrial organizations in Alexandria, Egypt. The study findings revealed that the specified dimensions of ICTs positively affect workforce productivity of industrial organizations in Alexandria, Egypt
description: This paper has been withdrawn by the author. major analysis errors
A Sparse Reduced Rank Framework for Group Analysis of Functional Neuroimaging Data
Creators: name: Shen, Haipeng
name: Zhu, Hongtu
name: Ahn, Mihye
name: Lin, Weili
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2015

description: In spatial-temporal neuroimaging studies, there is an evolving literature on the analysis of functional imaging data in order to learn the intrinsic functional connectivity patterns among different brain regions. However, there are only few efficient approaches for integrating functional connectivity pattern across subjects, while accounting for spatial-temporal functional variation across multiple groups of subjects. The objective of this paper is to develop a new sparse reduced rank (SRR) modeling framework for carrying out functional connectivity analysis across multiple groups of subjects in the frequency domain. Our new framework not only can extract both frequency and spatial factors across subjects, but also imposes sparse constraints on the frequency factors. It thus leads to the identification of important frequencies with high power spectra. In addition, we propose two novel adaptive criteria for automatic selection of sparsity level and model rank. Using simulated data, we demonstrate that SRR outperforms several existing methods. Finally, we apply SRR to detect group differences between controls and two subtypes of attention deficit hyperactivity disorder (ADHD) patients, through analyzing the ADHD-200 data.
Length control of an optical resonator using second-order transverse modes
Creators: name: Miller, John
name: Evans, Matthew
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present the analysis of an unorthodox technique for locking a laser to a resonant optical cavity. Error signals are derived from the interference between the fundamental cavity mode and higher-order spatial modes of order two excited by mode mismatch. This scheme is simple, inexpensive and, in contrast to similar techniques, first-order-insensitive to beam jitter. After mitigating sources of technical noise, performance is fundamentally limited by quantum shot-noise.
Penalized Q-learning for dynamic treatment regimens
Creators: name: Song, Rui
name: Wang, Weiwei
name: Zeng, Donglin
name: Kosorok, Michael R.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2015

description: A dynamic treatment regimen incorporates both accrued information and long-term effects of treatment from specially designed clinical trials. As these trials become more and more popular in conjunction with longitudinal data from clinical studies, the development of statistical inference for optimal dynamic treatment regimens is a high priority. In this paper, we propose a new machine learning framework called penalized Q-learning, under which valid statistical inference is established. We also propose a new statistical procedure: individual selection and corresponding methods for incorporating individual selection within penalized Q-learning. Extensive numerical studies are presented which compare the proposed methods with existing methods, under a variety of scenarios, and demonstrate that the proposed approach is both inferentially and computationally superior. It is illustrated with a depression clinical trial study.
Non-crossing large-margin probability estimation and its application to robust SVM via preconditioning
Creators: name: Liu, Yufeng
name: Wu, Yichao
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2011

description: Many large-margin classifiers such as the Support Vector Machine (SVM) sidestep estimating conditional class probabilities and target the discovery of classification boundaries directly. However, estimation of conditional class probabilities can be useful in many applications. Wang, Shen, and Liu (2008) bridged the gap by providing an interval estimator of the conditional class probability via bracketing. The interval estimator was achieved by applying different weights to positive and negative classes and training the corresponding weighted large-margin classifiers. They propose to estimate the weighted large-margin classifiers individually. However, empirically the individually estimated classification boundaries may suffer from crossing each other even though, theoretically, they should not.
Higher-Spin Modes in a Domain-Wall Universe
Creators: name: Kulaxizi, Manuela
name: Rahman, Rakibur
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We find a consistent set of equations of motion and constraints for massive higher-spin fluctuations in a gravitational background, required of certain characteristic properties but more general than constant curvature space. Of particular interest among such geometries is a thick domain wall--a smooth version of the Randall-Sundrum metric. Apart from the graviton zero mode, the brane accommodates quasi-bound massive states of higher spin contingent on the bulk mass. We estimate the mass and lifetime of these higher-spin resonances, which may appear as metastable dark matter in a braneworld universe.
description: minor changes made, to appear in JHEP
"SMP_13_002_TABLES.tar.gz" of "Measurement of the ratio of inclusive jet cross sections using the anti-kt algorithm with radius parameters R = 0.5 and 0.7 in pp collisions at sqrt(s) = 7 TeV"
Creators: name: CMS Collaboration
Publisher: name: HEPData
Year: 2015

description: Correlation and systematics tables
description: CERN-LHC. Measurements of the inclusive jet cross section with the anti-kt clustering algorithm are presented for two radius parameters, R=0.5 and 0.7. They are based on data from LHC proton-proton collisions at $\sqrt{s}$ = 7 TeV corresponding to an integrated luminosity of 5.0 inverse femtobarns collected with the CMS detector in 2011. The ratio of these two measurements is obtained as a function of the rapidity and transverse momentum of the jets. Significant discrepancies are found comparing the data to leading-order simulations and to fixed-order calculations at next-to-leading order, corrected for nonperturbative effects, whereas simulations with next-to-leading-order matrix elements matched to parton showers describe the data best.
Nonparametric Bounds and Sensitivity Analysis of Treatment Effects
Creators: name: Gilbert, Peter B.
name: Richardson, Amy
name: Fine, Jason P.
name: Hudgens, Michael G.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2014

description: This paper considers conducting inference about the effect of a treatment (or exposure) on an outcome of interest. In the ideal setting where treatment is assigned randomly, under certain assumptions the treatment effect is identifiable from the observable data and inference is straightforward. However, in other settings such as observational studies or randomized trials with noncompliance, the treatment effect is no longer identifiable without relying on untestable assumptions. Nonetheless, the observable data often do provide some information about the effect of treatment, that is, the parameter of interest is partially identifiable. Two approaches are often employed in this setting: (i) bounds are derived for the treatment effect under minimal assumptions, or (ii) additional untestable assumptions are invoked that render the treatment effect identifiable and then sensitivity analysis is conducted to assess how inference about the treatment effect changes as the untestable assumptions are varied. Approaches (i) and (ii) are considered in various settings, including assessing principal strata effects, direct and indirect effects and effects of time-varying exposures. Methods for drawing formal inference about partially identified parameters are also discussed.
6 Briefe an [Johann Caspar] Lavater
Brief an Lavater ...
Creators: name: Prittwitz, Leopold von
Publisher: name: [s.n.]
Year: 1789

description: von Leopold v[on] Prittwitz
description: Davon 1 Brief undatiert, Monat und Jahr ergänzt nach Empfang, sowie eigenhändige Notiz Lavaters vorhanden dat. 3.10.1789 (Nr. 344); 1 Brief undatiert (Nr. 345); 1 Brief undatiert, Monat und Jahr ergänzt nach Empfang (Nr. 346); bei 1 Brief Jahr ergänzt nach Empfang (Nr. 349)
description: Prittwitz: Baron
description: Mit eigenh. Notiz Lavaters "Betrüger" bei der Unterschrift (Nr. 349)
IMPACT OF DOMESTIC CREDIT ON ECONOMIC PERFORMANCE IN NIGERIA
Creators: name: ATADIOSE SUNDAY
name: Dr. ELEJE EMMANUEL CHINEDU
name: AMBAM, AWAH PRIDY
name: ONWUMERE J.U.J
Publisher: name: Zenodo
Year: 2024
Subjects: Domestic Credit, Gross Domestic Product, Interest Rate, Unemployment Rate.

description: Abstract

This study examined the impact of domestic credit on economic performance in Nigeria from the period 1991-2022. The study utilized ARDL bound test approach to analyze the result. Gross domestic product, unemployment rate and interest rate were used as the measure for economic performance indicators, while net credit to the private sector and net credit to the public sector were adopted as measure of domestic credit. The findings showed that gross domestic product had positive but non-significant impact on both credit to the private and public sectors in Nigeria. While unemployment rate had negative and non-significant impact on both credit to the private and public sectors in Nigeria. The study recommended that, government and its agencies must take proactive steps in ensuring that prudent level of public debt, regular debt sustainability analyses, adequate monitoring of credit channels are maintain within the financial system, so as to achieve a balance between facilitating credit availability for economic growth and avoiding excessive credit expansion, which could lead to financial instability.
Direct formulation to Cholesky decomposition of a general nonsingular correlation matrix
Creators: name: Madar, Vered
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2015

description: We present two novel and explicit parametrizations of Cholesky factor of a nonsingular correlation matrix. One that uses semi-partial correlation coefficients, and a second that utilizes differences between the successive ratios of two determinants. To each, we offer a useful application.
Exact confidence intervals in the presence of interference
Creators: name: Rigdon, Joseph
name: Hudgens, Michael G.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2015

description: For two-stage randomized experiments assuming partial interference, exact confidence intervals are proposed for treatment effects on a binary outcome. Empirical studies demonstrate the new intervals have narrower width than previously proposed exact intervals based on the Hoeffding inequality.
Utility-based Weighted Multicategory Robust Support Vector Machines
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010

description: The Support Vector Machines (SVM) has been an important classification technique in both machine learning and statistics communities. The robust SVM is an improved version of the SVM so that the resulting classifier can be less sensitive to outliers. In many practical problems, it may be advantageous to use different weights for different types of misclassification. However, the existing RSVM treats different kinds of misclassification equally. In this paper, we propose the weighted RSVM, as an extension of the standard SVM. We show that surprisingly, the cost-based weights do not work well for weighted extensions of the RSVM. To solve this problem, we propose a novel utility-based weights for the weighted RSVM. Both theoretical and numerical studies are presented to investigate the performance of the proposed weighted multicategory RSVM.
What surface maximizes entanglement entropy?
Creators: name: Astaneh, Amin Faraji
name: Gibbons, Gary
name: Solodukhin, Sergey N.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: For a given quantum field theory, provided the area of the entangling surface is fixed, what surface maximizes entanglement entropy? We analyze the answer to this question in four and higher dimensions. Surprisingly, in four dimensions the answer is related to a mathematical problem of finding surfaces which minimize the Willmore (bending) energy and eventually to the Willmore conjecture. We propose a generalization of the Willmore energy in higher dimensions and analyze its minimizers in a general class of topologies $S^m\times S^n$ and make certain observations and conjectures which may have some mathematical significance.
description: 21 pages, 2 figures; V2: typos fixed, Refs. added
Multi-pulse homoclinic loops in systems with a smooth first integral
Creators: name: Turaev, Dmitry
Publisher: name: Weierstrass Institute
Year: 2000
Subjects: subject: Hamiltonian dynamics
subject: localized solution
subject: orbit-flip
subject: homoclinic bifurcation
subject: hyperbolic set
subject: superhomoclinic orbit
subject: 37J45
subject: 37G20
subject: 37D05
subject: 37J30
subject: 37G30
subject: 37G05
subject: 34C20
subject: 34C37

description: We prove that the orbit-flip bifurcation in the systems with a smooth first integral (e.g. in the Hamiltonian ones) leads to appearance of infinitely many multi-pulse self-localized solutions. We give a complete description to this set in the language of symbolic dynamics and reveal the role played by special non-selflocalized solutions (e.g. periodic and heteroclinic ones) in the structure of the set of self-localized solutions. We pay a special attention to the superhomoclinic ("homoclinic to homoclinic") orbits whose presence leads to a particularly rich structure of this set.
The Bayesian Covariance Lasso
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2013

description: Estimation of sparse covariance matrices and their inverse subject to positive definiteness constraints has drawn a lot of attention in recent years. The abundance of high-dimensional data, where the sample size (n) is less than the dimension (d), requires shrinkage estimation methods since the maximum likelihood estimator is not positive definite in this case. Furthermore, when n is larger than d but not sufficiently larger, shrinkage estimation is more stable than maximum likelihood as it reduces the condition number of the precision matrix. Frequentist methods have utilized penalized likelihood methods, whereas Bayesian approaches rely on matrix decompositions or Wishart priors for shrinkage. In this paper we propose a new method, called the Bayesian Covariance Lasso (BCLASSO), for the shrinkage estimation of a precision (covariance) matrix. We consider a class of priors for the precision matrix that leads to the popular frequentist penalties as special cases, develop a Bayes estimator for the precision matrix, and propose an efficient sampling scheme that does not precalculate boundaries for positive definiteness. The proposed method is permutation invariant and performs shrinkage and estimation simultaneously for non-full rank data. Simulations show that the proposed BCLASSO performs similarly as frequentist methods for non-full rank data.
1 Brief an [Johann] Caspar Lavater
Brief an Lavater ...
Creators: name: Pomp, Nicolaus
name: Deutsche Reformierte Gemeinde Baltimore
Publisher: name: [s.n.]
Year: 1788

description: von N[icolaus] Pomp
description: Mitunterzeichnet von den Ältesten und Diaconi der dt. reform. Gemeinde von Baltimore/Maryland: Michael und Daniel Dieffenderffer, Philipp Crupius, Johannes Bietzel, Daniel Peters, Jakob Hoffman, Wolfgang Etsperger
description: Pomp: 1734-1819, Prediger in Baltimore
Analysis of Binary Adherence Data in the Setting of Polypharmacy: A Comparison of Different Approaches
Creators: name: Roth, Mary T.
name: Moore, Charity G.
name: Esserman, Denise A.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2009

description: Older community dwelling adults often take multiple medications for numerous chronic diseases. Non-adherence to these medications can have a large public health impact. Therefore, the measurement and modeling of medication adherence in the setting of polypharmacy is an important area of research. We apply a variety of different modeling techniques (standard linear regression; weighted linear regression; adjusted linear regression; naïve logistic regression; beta-binomial (BB) regression; generalized estimating equations (GEE)) to binary medication adherence data from a study in a North Carolina based population of older adults, where each medication an individual was taking was classified as adherent or non-adherent. In addition, through simulation we compare these different methods based on Type I error rates, bias, power, empirical 95% coverage, and goodness of fit. We find that estimation and inference using GEE is robust to a wide variety of scenarios and we recommend using this in the setting of polypharmacy when adherence is dichotomously measured for multiple medications per person.
Link Floer homology categorifies the Conway function
Creators: name: Benheddi, Mounir
name: Cimasoni, David
Publisher: name: arXiv
Year: 2014
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25

description: Given an oriented link in the 3-sphere, the Euler characteristic of its link Floer homology is known to coincide with its multivariate Alexander polynomial, an invariant only defined up to a sign and powers of the variables. In this paper, we get rid of this ambiguity by proving that this Euler characteristic is equal to the so-called Conway function, the representative of the multivariate Alexander polynomial introduced by Conway in 1970 and explicitly constructed by Hartley in 1983. This is achieved by creating a model of the Conway function adapted to rectangular diagrams, which is then compared to the Euler characteristic of the combinatorial version of link Floer homology.
description: 20 pages, many figures; final version to appear in Proc. Edinburgh Math. Soc
Comparison of Isotonic Designs for Dose-Finding
Creators: name: Ivanova, Anastasia
name: Flournoy, Nancy
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2009

description: We compare several decision rules for allocating subjects to dosages that are based on sequential isotonic estimates of a monotone dose–toxicity curve. We conclude that the decision rule in which the next assignment is to the dose having probability of toxicity closest to target does not work well. The best rule in our comparison is given by the cumulative cohort design. According to this design, the dose for the next subject is decreased, increased, or repeated depending on the distance between the estimated toxicity rate at the current dose and the target quantile.
Dose-Weighted Adjusted Mantel-Haenszel Tests for Numeric Scaled Strata in a Randomized Trial
Creators: name: Cheng, Nancy F.
name: Gansky, Stuart A.
name: Koch, Gary G.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2011

description: A recent three-arm parallel groups randomized clinical prevention trial had a protocol deviation causing participants to have fewer active doses of an in-office treatment than planned. The original statistical analysis plan stipulated a minimal assumption randomization-based extended Mantel-Haenszel (EMH) trend test of the high frequency, low frequency, and zero frequency treatment groups and a binary outcome. Thus a dose-weighted adjusted EMH (DWAEMH) test was developed with an extra set of weights corresponding to the number of active doses actually available, in the spirit of a pattern mixture model. The method can easily be implemented using standard statistical software. A set of Monte Carlo simulations using a logistic model was undertaken with (and without) actual dose-response effects through 1000 replicates for empirical power estimates (and 2100 for empirical size). Results showed size was maintained and power was improved for DWAEMH versus EMH and logistic regression Wald tests in the presence of a dose effect and treatment by dose interaction.
title: Neue Materialien des Bayerischen Neolithikums 3. Tagung im Kloster Windberg vom 16. bis 18. November 2018
title: New Material of the Bavarian Neolithic 3 - Conference at Windberg monastery november 16th to 18th 2018
Creators: name: Husty, Ludwig
name:  Link , Thomas
name: Pechtl , Joachim
Publisher: name: Würzburg University Press
Year: 2020
Subjects: subject: 930 Geschichte des Altertums bis ca. 499, Archäologie

description: Würzburger Studien zur Vor- und Frühgeschichtlichen Archäologie; 6
Multiple Hypothesis Testing for Experimental Gingivitis Based on Wilcoxon Signed Rank Statistics
Creators: name: Offenbacher, Steven
name: Sen, Pranab K.
name: Preisser, John S.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2011

description: Dental research often involves repeated multivariate outcomes on a small number of subjects for which there is interest in identifying outcomes that exhibit change in their levels over time as well as to characterize the nature of that change. In particular, periodontal research often involves the analysis of molecular mediators of inflammation for which multivariate parametric methods are highly sensitive to outliers and deviations from Gaussian assumptions. In such settings, nonparametric methods may be favored over parametric ones. Additionally, there is a need for statistical methods that control an overall error rate for multiple hypothesis testing. We review univariate and multivariate nonparametric hypothesis tests and apply them to longitudinal data to assess changes over time in 31 biomarkers measured from the gingival crevicular fluid in 22 subjects whereby gingivitis was induced by temporarily withholding tooth brushing. To identify biomarkers that can be induced to change, multivariate Wilcoxon signed rank tests for a set of four summary measures based upon area under the curve are applied for each biomarker and compared to their univariate counterparts. Multiple hypothesis testing methods with choice of control of the false discovery rate or strong control of the family-wise error rate are examined.
Metastability and small eigenvalues in Markov chains
Creators: name: Bovier, Anton
name: Eckhoff, Michael
name: Gayrard, Véronique
name: Klein, Markus
Publisher: name: Weierstrass Institute
Year: 2000
Subjects: subject: Markov chains
subject: metastability
subject: eigenvalue problems
subject: exponential distribution
subject: 60J10
subject: 60K35

description: In this letter we announce rigorous results that elucidate the relation between metastable and low-lying eigenvalues in Markov chains in a much more general setting and with considerable greater precision as was so far available. This includes a sharp uncertainty principle relating all low-lying eigenvalues to mean times of metastable transitions, a relation between the support of eigenfunctions and the attractor of a metastable state, and sharp estimates on the convergence of probability distribution of the metastable transition times to the exponential distribution.
Assessing Similarity to Existing Drugs to Decide Whether to Continue Drug Development
Creators: name: Ibrahim, Joseph G.
name: Chi, Eric
name: Ma, Guoguang Julie
name: Parker, Robert A.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2012

description: Developing a drug requires large investments, over many years, with dramatic increases in development costs at later stages. Thus, one wants to make a No Go decision on a compound early, unless evidence continues to suggest that the project will ultimately be successful, so that resources can be focused on the most promising compounds to benefit patients. Instead of predicting the probability of success of a Phase III study, our approach to this decision uses the Phase II study results to assess similarity of the novel compound to existing drugs that are classified by different decision categories, such as a clear Go decision (e.g., a clearly effective drug), a (unfortunately common) Not Sure decision (e.g., a potentially useful but not outstanding drug), and a clear No Go decision (e.g., a clearly not effective drug). We describe how this modeling can be done using both individual and binary endpoints and how results can be combined for several different endpoints. Potential extensions of the method are also discussed.
A hadronic calorimeter with Glass RPC as sensitive medium
Creators: name: Grenier, Gérald
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The SDHCAL technological prototype is a $1 \times 1 \times 1.3$ m$^3$ high-granularity Semi-Digital Hadronic CALorimeter using Glass Resistive Plate Chambers as sensitive medium. It is one of the two HCAL options considered by the ILD Collaboration to be proposed for the detector of the future International Linear Collider project. The prototype is made of up to 50 GRPC detectors of 1 m$^2$ size and 3 mm thickness each with an embedded semi-digital electronics readout that is autotriggering and power-pulsed. The GRPC readout is finely segmented into pads of 1 cm$^2$. Measured performances of the GRPC and the full SDHCAL prototype in terms of homogeneity, low noise and energy resolution are presented in this proceeding.
description: On behalf of CALICE collaboration and the SDHCAL group. Proceeding of the RPC2014 conference
D5.2 Tool for Predictive Maintenance and outputs for Digital Twin
Creators: name: Enrich, Regina
name: Kampouropoulos, Konstantinos
name: Quintana, Antoni
name: Ortega, Enric
name: Òscar Subirats
Publisher: name: Zenodo
Year: 2023

description: Tool for Predictive Maintenance and outputs for the digital twin.
Estimation of AUC or Partial AUC Under Test-Result-Dependent Sampling
Creators: name: Zhou, Haibo
name: Wang, Xiaofei
name: Ma, Junling
name: George, Stephen
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2012

description: The area under the ROC curve (AUC) and partial area under the ROC curve (pAUC) are summary measures used to assess the accuracy of a biomarker in discriminating true disease status. The standard sampling approach used in biomarker validation studies is often inefficient and costly, especially when ascertaining the true disease status is costly and invasive. To improve efficiency and reduce the cost of biomarker validation studies, we consider a test-result-dependent sampling (TDS) scheme, in which subject selection for determining the disease state is dependent on the result of a biomarker assay. We first estimate the test-result distribution using data arising from the TDS design. With the estimated empirical test-result distribution, we propose consistent nonparametric estimators for AUC and pAUC and establish the asymptotic properties of the proposed estimators. Simulation studies show that the proposed estimators have good finite sample properties and that the TDS design yields more efficient AUC and pAUC estimates than a simple random sampling (SRS) design. A data example based on an ongoing cancer clinical trial is provided to illustrate the TDS design and the proposed estimators. This work can find broad applications in design and analysis of biomarker validation studies.
1 Brief an [Johann Caspar Lavater]
Brief an Lavater ...
Creators: name: Poterat, Pierre Claude de
Publisher: name: [s.n.]
Year: 1796

description: von M[arqu]is De Poterat
description: Brief undatiert, Datum mit Bleistift von späterer Hand ergänzt
description: Notiz von Lavaters Hand: "St. André"
description: Poterat: Marquis de