HDTenEightyP/NetNews huggingface dataset:
From: maurits@cs.kuleuven.ac.be (Maurits Malfait)
Subject:   Metropolis sampler
Keywords: Metropolis sampler
Organization: Dept. Computerwetenschappen K.U.Leuven
Date: Thu, 7 Jan 1993 12:08:31 GMT

We are working on an algorithm  that  incorporates  a  Metropolis
sampler  (*).   Therefore  we  are  interested  in references and
information concerning:

1. The convergence properties of a Metropolis sampler:
   - when  is  the  starting  state  of  a   Metropolis   sampler
     'forgotten'?
   - how fast and how  good  does  the  sampler  approximate  the
     Boltzmann distribution?
2. Variants of the Metropolis algorithm and recent developments.
3. Possibilities to accelerate a Metropolis sampler.

Concerning the 3rd question, we know of approaches by  Aarts  and
Van   Laarhoven  to  parallelize  simulated  annealing  known  as
systolic and clustered algorithms.  These might be applied to the
Metropolis  sampler  running  on  one  fixed  temperature.  Other
approaches distribute the generation of new states of one sampler
among  processors  but  have  a  speed-up  that  depends  on  the
temperature.  We prefer to avoid this.

Thankyou in advance for any references and hints;  please  e-mail
your reply to me: maurits@cs.kuleuven.ac.be.

(*) A Metropolis sampler generates a sequence of states such that
the  frequency  of  the  states  in this chain is proportional to
their probability in a given Boltzmann distribution.   Metropolis
samplers  are often used to simulate the equilibrium distribution
in the inner loop of simulated annealing.  We are  interested  in
the  distribution  at  just  one  fixed  temperature,  whereas in
simulated annealing one decreases the temperature  in  the  outer
loop.

Maurits Malfait
--
+-----------------------------------+--------------------------------+
| Email: na.malfait@na-net.ornl.gov | Maurits Malfait                |
|                    or, preferably | Katholieke Universiteit Leuven |
| Maurits.Malfait@cs.kuleuven.ac.be | Department of Computer Science |
| Phone:       + 32 16 201015 x3080 | Celestijnenlaan 200A           |
| Fax:               + 32 16 205308 | B-3001 Leuven (Belgium-Europe) |
+-----------------------------------+--------------------------------+
From: gmmiller@mcs.drexel.edu (Michael R. Miller)
Newsgroups: sci.math.stat
Subject: Applied Math - what do YOU do?
Summary: survey of applied mathematicians
Keywords: applied math, tools, visualization, modeling
Date: 8 Jan 93 18:51:45 GMT
Distribution: sci.math.stat
Organization: Drexel University

I would like to gather information regarding some of the more 
interesting work done by applied mathematicians in industry and 
in academia.

I am especially interested in users of tools such as Mathematica, 
Maple, Matlab, et. al. in visualization, modeling, and data analysis work.

I welcome all responses, but am curious about the following areas:
     medical research
     image processing (esp. fractals)
     space, aeronautics
     weather forecasting
     physics (esp. lasers)
     signal processing
     information theory

Please e-mail your responses (short or long!) directly to me 
(gmmiller@mcs.drexel.edu).  The survey is for my own use (academic and 
career guidance).  If the responses warrant it, I will summarize and 
post the results.

If you love your job, here's a chance to brag about it!    :)

Thanks very much -- and happy 1993!

Mike Miller
(gmmiller@mcs.drexel.edu)
Newsgroups: sci.math.stat
From: dmurdoch@mast.queensu.ca (Duncan Murdoch)
Subject: Re: Nonrandom Random Numbers?
Organization: Queen's University
Date: Tue, 12 Jan 1993 21:47:10 GMT

In article <dmurdoch.393.726873235@mast.queensu.ca> dmurdoch@mast.queensu.ca (Duncan Murdoch) writes:
>The paper is Ferrenberg, A. M., Landau, D.P., and Wong, Y.J. (1992), Monte 
>Carlo simulations:  hidden errors from "good" random number generators,
>Physical Review Letters 69 no. 23, 3382-3384.

Oops, I forgot to mention:

The authors did find that simple variations on the algorithms (e.g. only use 
every 5th random number) gave acceptable results.

Duncan Murdoch
dmurdoch@mast.queensu.ca
From: tanm@bio1.bst.rochester.edu (Martin Tanner)
Newsgroups: sci.math.stat
Subject: postdoctoral positions
Date: 5 Jan 93 14:47:19 GMT
Organization: University of Rochester (Rochester, NY)


The Department of Biostatistics at the University of Rochester invites
applications for NIH funded postdoctoral positions, beginning 6/1/93.
Post-doctoral fellows will participate in the design and analysis of clinical
and epidemiological studies in cancer, AIDS and environmental health, as  
well as conduct their own independent research.  These positions require
permanent residence in the US or US citizenship.  Postdoctoral applicants
must possess a PhD or equivalent.  Contact:

Martin Tanner
Dept of Biostatistics - Box 630
University of Rochester Medical Center
60l Elmwood Ave
Rochester NY l4642
tanm@seneca.bst.rochester.edu
Newsgroups: sci.math.stat
From: jaap@meishan.animal.uiuc.edu (Jaap van Milgen)
Subject: intrinsic nonlinearity
Organization: University of Illinois at Urbana
Date: Tue, 5 Jan 1993 09:44:14 GMT
Keywords: nonlinear model

I am looking for a program that can calculate the intrinsic nonlinearity (or
intrinsic curvature) of a nonlinear model.  I am aware that David Ratkowsky has
listed FORTAN code for this in his book "Nonlinear regression modeling" (Marcel
Dekker Inc., 1983), but I would like to avoid retyping the 30+ pages of code.
Is anyone aware of site that has this code (or a similar program) available for
FTP?  An e-mail address of the author (Ratkowsky) also would be helpful.

Thanks in advance,

Jaap van Milgen
jaap@meishan.animal.uiuc.edu
Newsgroups: sci.math.stat
From: aet@mundil.cs.mu.OZ.AU (Albert Edward THOMPSON)
Subject: Books On The Foundations Of Statistics?
Organization: Computer Science, University of Melbourne, Australia
Date: Fri, 8 Jan 1993 08:04:02 GMT


hi!

can anyone suggest a good book on the foundations of statistics,
inductive logic, axiomatic probability and the like?

	bert.

--------------------------------------------------------------------------------
bert thompson	aet@munagin.ee.mu.oz.au.
SITEE		school of information technology and electrical engineering
		university of melbourne
--------------------------------------------------------------------------------
     g e t  t h e  p o i n t 
--------------------------------------------------------------------------------
Newsgroups: sci.math.stat
From: regeorge@magnus.acs.ohio-state.edu (Robert E George)
Subject: Re: Books On The Foundations Of Statistics?
Organization: The Ohio State University
Date: Fri, 8 Jan 1993 19:53:34 GMT

"The Foundations of Statistics" by Leonard "Jimmie" Savage
(possibly still in Dover paperback edition?)


Robert George
(speaking only for myself)
Newsgroups: sci.math.stat
From: iwelch@agsm.ucla.edu (Ivo Welch)
Subject: SAS out-of-sample forecasting routine
Organization: UCLA, Anderson Graduate School Of Management
Date: 12 Jan 93 11:15:38 PST


My ultimate goal is to compare different-type  regressions on panel data
sets;  some regressions have  firm-specific intercepts, others  are more
complex.   I would like  to  forecast  with  this panel  regression on a
hold-out sample,  and produce an MSE.  Is  there a SAS routine that can
use a previous model statement and forecast out of sample?

(Note that some variables may be perfectly collinear.)  It would be nice
if SAS could automatically match variables from a  "same type" data set,
especially if there are  perfectly collinear variables, which  would  of
course disturb the coefficient estimates but not the forecast.

I realize that this might be writeable with some intricate data
statements. I was hoping this was common enough a request that someone
had already done this for public consumption.

/ivo welch
From: wtj@goanna.cs.rmit.oz.au (Wayne Jenkins)
Newsgroups: sci.math.stat
Subject: Chernoff-Hoeffding bounds???
Date: 8 Jan 93 07:07:09 GMT
Organization: Comp Sci, RMIT, Melbourne, Australia


An author of a recent paper has referred to Chernoff-Hoeffning bounds:

	"Chernoff-Hoeffding bounds are used to determine the sample size
	N needed to bound the error in the probability estimate"

Unfortunately, no reference has been cited.  Can anyone point me toward
a reference for this material.  The statistics books available in our
library dont seem to refer to it and my search through abstracts hasnt
been able to locate these bounds under this name.

Any help would be much appreciated!!!!

Thanks,

Wayne.
Newsgroups: sci.math.stat,sci.math.num-analysis,sci.math
From: dzk@cs.brown.edu (Danny Keren)
Subject: Data Regarding Smoothing Parameter in Regularization
Organization: Brown University Department of Computer Science
Date: Mon, 4 Jan 1993 17:38:26 GMT

Hi everybody,

I would be very grateful for information regarding the selection of the
smoothing parameter in regularization. Specificaly, what I need
is data (1-D and 2-D), and the smoothing parameter that was
chosen for it, by any method whatsoever (cross-validation, for
instance). The more data sets the better.

Thanks,

-Danny Keren.

Newsgroups: sci.math.stat
From: vms@jyu.fi (Veli Matti Suppola)
Subject: Skew distribution 
Keywords: simulation, skewness
Organization: University of Jyvaskyla, Finland
Date: Fri, 8 Jan 1993 19:36:59 GMT

Hi!

It is easy to simulate two normal distribution whose correlation
is close to one.

It is quite easy to simulate two skew distribution whose correlation
is close to one.

The problem is, how to simulate one normal distribution and one skew
distribution whose correlation is close to one?

I use Fortran (NAG) in my simulations
Organization: University of Illinois at Chicago
Date: Mon, 11 Jan 1993 16:18:16 CST
From: <U53644@uicvm.uic.edu>
Newsgroups: sci.math.stat
Subject: Query : Time series confidence intervals

OK, maybe I'm reading the wrong books, but...............

       In the (admittedly few) books I've looked into of late on the subject of
time series analysis, I've found a number of estimators for the coefficients
for each given model (ARIMA, etc) one might try to fit to the data, but no
confidence bounds for those coefficients (assuming the models to be valid).
I would be most grateful if someone would steer me in the right direction here.

                          Joseph B. Dunphy

                         "He lead a double life - a staunch frequentist by day,
                          but a wild and reckless Bayesian by night !"

Newsgroups: sci.math.stat
From: koenker@ux1.cso.uiuc.edu (Roger Koenker)
Subject: asa directory
Summary: query about asa membership list in electronic form
Organization: University of Illinois at Urbana
Date: Thu, 7 Jan 1993 21:23:50 GMT

Can someone tell me whether the ASA directory is available in electronic
form and if so whether someone has written an interface for it.  I vaguely
remember hearing that Doug Bates had done this as part of the perl-CIS
project, but perhaps this was wishful thinking on my part.

Roger Koenker

PS.  The Bates-Tukey software for CIS deserves some sort of medal of honor
from the ASA in my view.
From: chaas@coe.drexel.edu (Chuck Haas)
Newsgroups: sci.math.stat
Subject: Nonrandom Random Numbers?
Date: 12 Jan 93 13:23:19 GMT
Organization: Drexel University
X-Xxmessage-Id: <A77831AA8C0118D7@n1-24-215-coe-abbotts.coe.drexel.edu>
X-Xxdate: Tue, 12 Jan 93 00:28:26 GMT
X-Useragent: Nuntius v1.1.1d17

There was an article in today's (1/12/93) New York Times (page 1, section
C) about some IBM researchers who found deficiencies in "standard" random
number generators when using some crystallographic type of test.  Anyone
on the net who would care to add details?  What generators (I presume one
of the linear congruential ones); but did these also include the
shuffling algorithm advocated in Numerical Recipes?





Charles N. Haas
Professor, Environmental Engineering
Drexel University, Philadelphia PA 19104
======================================
CHaas@COE.Drexel.Edu
From: jerry@hnrc.tufts.edu (Jerry Dallal)
Newsgroups: sci.math.stat
Subject: Re: Books On The Foundations Of Statistics?
Date: 11 Jan 93 14:01:28 GMT
Organization: USDA HNRC at Tufts University

The "foundations" of statistics is a broad topic (no pun intended) and can
mean different things to different people.  If you'd like a quick overview/
comparison of different schools of statistical inference, you might try
Barnett's Comparative Statistical Inference (Wiley).  If your interest is
more in the area of probability, try Kyburg and Smokler (eds) Studies in
Subjective Probability (Wiley, sold to Krieger).
Xref: sparky sci.math:17838 sci.math.stat:2730
From: brani@isds.duke.edu (Brani Vidakovic)
Newsgroups: sci.math,sci.math.stat
Subject: OLD VOLUMES OF ANNALS
Keywords: Wanted, Annals of Statistics
Date: 8 Jan 93 15:36:22 GMT
Followup-To: brani@durer.isds.duke.edu
Distribution: usa



I would like to buy back issues of
Annals of Statistics  19** - 1989.
IMS prices are to high for me.

Brani Vidakovic, ISDS, Duke University
Durham, NC 27706

brani@durer.isds.duke.edu

            
-- 
----------------------------------------------------------------------------
Brani Vidakovic                                   tel. office 919-684-8025
DUKE, ISDS, Box 90251                             tel. home   919-933-5374
Durham, NC 27708-0251  Home:  2525 Booker Creek 12-H, Chapell Hill, NC 27514
From: sec@otter.hpl.hp.com (Simon Crouch)
Date: Mon, 11 Jan 1993 10:13:11 GMT
Subject: Re: Fields Medal Winners
Organization: Hewlett-Packard Laboratories, Bristol, UK.
Newsgroups: sci.math

In sci.math, gjm11@cus.cam.ac.uk (G.J. McCaughan) writes:

     [useful bits deleted]
> ...  and Part III (what used to be Part II; now a post-graduate course)
> is as crap as ever.

Ah, I'm glad to see that standards are being maintained :-)

Simon.

Newsgroups: sci.math
From: len@schur.math.nwu.edu (Len Evens)
Subject: Re: Fields Medal Winners
Organization: Dept of Math, Northwestern Univ
Date: Sat, 9 Jan 1993 15:09:18 GMT

In article <erwin.726504145@trwacs> erwin@trwacs.fp.trw.com (Harry Erwin) writes:
>At one time, I was under the impression that Bott and Artin had won the
>Fields Medal. It seems I'm wrong. Can someone confirm or deny? 
>
>This impression is associated with one of those stories. I understand
>Artin, Atiyah, and Bott were the first three at the math tripos one year
>at Oxford (1950?). Apparently it made quite an impression.
>
>Cheers,
>-- 
>Harry Erwin
>Internet: erwin@trwacs.fp.trw.com
>

Emil Artin was a famous mathematician, probably in his 40's, and a
professor at Princeton in 1950.   Michael Artin was approximately
17 in 1950 and a high school student in the U.S.  I don't know where
Bott was in 1950, but I would be extremely surprised to learn he
was at Oxford.  



Leonard Evens      len@math.nwu.edu      708-491-5537
Dept. of Mathematics, Northwestern Univ., Evanston, IL 60208
Newsgroups: sci.math,sci.physics
From: ara@zurich.ai.mit.edu (Allan Adler)
Subject: Re: Euclidean domains
Organization: M.I.T. Artificial Intelligence Lab.
Date: Mon, 11 Jan 1993 04:38:11 GMT


Alfred Steele mentions that not everything in Hungerford's Algebra  is
correct. This, of course, is true of many books. One thing that I didn't
like about Hungerford's books was that he claims to give adequate
foundations for category theory. But I don't believe that is accurate,
since my recollection is that he never talks about the category of
functors from one category to another and I am not convinced that
the foundations he does give (basically, let the objects form a class in
Godel-von Neumann-Bernays set theory) are adequate for constructing
such categories of functors.

Developing category theory without functor categories and saying one is
thereby giving foundations for category theory is like taking the doctor's
advice when you tell him it hurts when you move your arm and he tells
you, "So don't move your arm..."

Allan Adler
ara@altdorf.ai.mit.edu
Newsgroups: sci.math,alt.books.technical
From: bathurst@ernie.Princeton.EDU (Bruce Bathurst)
Subject: Re: High Prices of Math Books. I am pissed.
Originator: news@nimaster
Organization: Princeton University
Date: Mon, 11 Jan 1993 09:00:23 GMT

In article <1993Jan6.212111.17381@ariel.ec.usf.edu>
mccolm@darwin.math.usf.edu. (Gregory McColm) writes:

[SNIP,SNIP]

>How 
>could it cost anywhere near that for Elsevier to make a copy?

[SNIP,SNIP]

A university instructor was selling his very useful statistical
program for prices beyond that of academics (let alone students).  He
was asked several times at a meeting how he determined the fair value
of his product.  He repeatedly answered with enthusiasm that a
marketing study showed he couldn't ask any more.

Bruce (Peripatetic Instructor)
-- 
Department of Geological and Geophysical Sciences
Princeton University, Princeton, NJ 08544
bathurst@phoenix.princeton.edu bathurst@pucc.bitnet !princeton!phoenix!bathurst
Newsgroups: sci.math,alt.flame
From: ilan@leland.Stanford.EDU (ilan vardi)
Subject: Re: Frankly,my dear......was: Fermat's Last Theorem
Organization: DSG, Stanford University, CA 94305, USA
Distribution: usa
Date: Mon, 11 Jan 93 01:06:17 GMT

>In article <1993Jan9.031339.6646@nuscc.nus.sg> matmcinn@nuscc.nus.sg (brett mcinnes) writes:
>
>>:  * the Riemann hypothesis? :  : -- 
>>Utterly boring in itself, like FLT; but unlike FLT, it is important
>>because you need it to prove things that are interesting. Just imagine the
>>sensation if it turns out to be wrong.                                    

The Riemann hypothesis is most important for its own sake. It says
that the prime numbers are essentially as evenly distributed as
possible and that there are no ``hidden'' tendencies for primes to
pull in any specific direction. The clearest way to explain this last
statement is to say that if RH were false then most numbers would have
an even number of prime factors or most numbers would have an odd
number of prime factors. 

Actually, RH is not that useful in analyzing certain problems about
primes, for example, it says that the difference between consecutive
prime is always smaller than about sqrt{p} which is very far from the
conjecture that it is of order (log p)^2 or slightly larger.
Moreover, due to work on the large sieve by Bombieri, Iwaniec etc.  
there are methods that do better than RH in some cases.

Newsgroups: sci.math
From: pwh@bradley.bradley.edu (Pete Hartman)
Subject: Re: Fermat's Last Theorem
Organization: Bradley University
Distribution: usa
Date: Wed, 6 Jan 93 16:26:58 GMT

Note to the more rigorous:  I am fully aware that
my post was vague and did not constitute a proof.
I had some thoughts that seemed too simple to be
true, but did seem to make sense from my background.

A few people have pointed out my errors, and I thank those
who were polite about it.  Back to programming for me! :-)
-- 
Pete Hartman		       Bradley University	pwh@bradley.bradley.edu
         "There is no time for metaphors," cried the little pill to me
             He said, "Life is a placebo masquerading as a simile."
Newsgroups: sci.math
From: gjm11@cus.cam.ac.uk (G.J. McCaughan)
Subject: Re: Frankly,my dear......was: Fermat's Last Theorem
Organization: U of Cambridge, England
Distribution: usa
Date: Sat, 9 Jan 1993 14:34:14 GMT

In article <1993Jan8.162334.31486@austin.onu.edu> yeomans@austin.onu.edu (Charles Yeomans) writes:
>In article <1993Jan7.171719.28657@infodev.cam.ac.uk>, gjm11@cus.cam.ac.uk (G.J. McCaughan) writes:
>> [stuff omitted]
>
>>  * Work on FLT was one of the big motivators for the theory of ideals. I don't
>>    call that trivial, boring, or even "recreational".
>> 
>It's not so clear that this is historically accurate.  Kummer was
>motivated to introduce ideal numbers - out of which came the theory of
>ideals, etc. - as a consequence of his work on higher reciprocity laws-
>a subject which was intensely studied in the 19th century, is largely
>ignored today because these laws are now a part of class field theory.
>I believe it was while studying reciprocity that Kummer was forced to
>consider problems of nonunique factorization.  On the other hand, it 
>was Lame who proposed the idea of factoring the Fermat equation over a
>cyclotomic field, but who didn't see that there was a problem with
>unique factorization.

OK; perhaps I was wrong. I thought that Kummer at one stage thought he
had a proof of FLT, but then noticed that it was wrong because of the
possible failure of unique factorisation. But I'm no expert on the
history of this sort of thing, so you're probably right.

-- 
Gareth McCaughan     Dept. of Pure Mathematics & Mathematical Statistics,
gjm11@cus.cam.ac.uk  Cambridge University, England.    [Research student]
Newsgroups: sci.math
From: dunne@math.okstate.edu (Ed Dunne)
Subject: Re: Why no Nobel Prize in Math?
Organization: Oklahoma State University, Math Department
Distribution: na
Date: Tue, 5 Jan 1993 17:27:59 GMT

yeomans@austin.onu.edu (Charles Yeomans) writes:

>In article <C06xJo.Grn@news.cso.uiuc.edu>, levine@symcom.math.uiuc.edu (Lenore Levine) writes:
>> 
>> >Well, I can add a mildly amusing bit of annecdotal evidence which suggests
>> >that there might be a grain of truth to the above.  (Take the implications
>> >with a few smileys, but the story *is* true, albeit more than a decade
>> >old.)
>> 
>> >A friend of the household, before I moved in, was active with COYOTE in the
>> >SF Bay Area.  I can't remember the acronym expansion, but it is (was?) an
>> >organization to promote legalized prostitution.  Among other things, COYOTE
>> >kept summary statistics of the sales activities of all their members, as
>> >ammunition for their lobbying battles.  There was always a big correlation
>> >between sales and a major convention in San Francisco.  Until the AMS had
>> >a major meeting there, that is.  COYOTE had its worst weekly sales ever!
>> 
>> Does that really mean that male mathematicians are less sexual? Or
>> merely less interested in women who have no sincere romantic interest in
>> them? 
>> 
>> 
>Or perhaps it means that mathematicians are cheap.

There is a joke that I only remember the outline of:

  A physician, a lawyer and a mathematician are all asked for their
  preferences: a lover or a spouse.  The physician answers (something
  like) a spouse -  you don't have to worry about your mate bringing
  home STDs.  The lawyer says a lover - you don't have to worry about
  a nasty divorce.  The mathematician says, `Both.  When the lover
  thinks you are with the spouse and the spouse thinks you are with the
  lover, you can get some mathematics done.'  

Newsgroups: sci.math
From: k2cheung@napier.uwaterloo.ca (William Cheung)
Subject: transfinite real numbers? (...probably not. :( )
Keywords: well defined?
Organization: University of Waterloo
Date: Mon, 11 Jan 1993 18:39:52 GMT

Dear netters,
  As Cantor claimed, his transfinite numbers exist concretely. I wonder if
a process similar to the construction of real number (e.g.Dedekind cut) can be
extended.
  Have fun, and thanks in advance.
William Cheung

Newsgroups: sci.math
From: jhg8680@uxa.cso.uiuc.edu (Jon  Hamkins)
Subject: HELP: limit
Summary: I need help with this limit.
Organization: University of Illinois at Urbana
Date: Mon, 11 Jan 1993 17:38:31 GMT
Keywords: limit, sum

   I need help with this limit:

              k+q  
              ---    i
          -k  \     k
 lim     e    /   -----  ,
k->infty      ---   i!
              i=0

where q is a positive integer constant.  The problem is made hard by
the k in the index screwing everything up.  The only thing I know about
the limit is that it is between 0 and 1: all terms are positive, and
                                   k
the sum is finitely many terms of e .  It appears to be monotonically
decreasing in k.

   Anyone have a solution?  Please e-mail.  I don't usually read this
group.  Thanks!

     ----Jon Hamkins  (hamkins@uiuc.edu)
         University of Illinios
         Urbana, IL