Judul: Penentuan Nilai Pembobotan dan Penduga Ragam Pada Penarikan Contoh Bertahap (Studi Kasus : Survei Pra Pemilihan Gubernur dan Wakil Gubernur Jawa Barat di Daerah Pemilihan Kota Bogor)
Abstrak: Sampling can be performed by using one or more stages. These stages are useful in order to obtain representative samples. It is often observed that parameters are estimated by assuming the samples are taken using simple random sampling (one stage) although they are taken using multistages which lead to invalid results. This study focus on estimation of parameters considering the stage in multistage sampling. As an illustration, we use pre-election survey of Governor and Vice Governor of West Java in Bogor City which involving three stages of selection, namely : (1) village within district, (2) neighborhood within village and (3) household within neighborhood. These stages are taken into account during estimation of number of voters in form of weights which are obtained by considering the selection process. It is obtained that the estimation using the weights are closer to the true number of voters released by KPU Bogor compared to the one not using the weights.
Keyword: Multistage Sampling, Estimation of Proportion, Weights and Variance of Estimators

Judul: Pendugaan Perolehan Suara Level Kabupaten/Kota pada Pemilihan Gubernur Jawa Barat Tahun 2013
Abstrak: Quick count is a method for verification of election results by estimating them from samples of the polling stations. Based on quick count simulation, direct estimation of election result at the level of subpopulations, for example at the county or city level on governor election, has greater risk of error in a relatively small sample size. One of the alternative methods for solving this problem is indirect estimation approach using small area estimation (SAE). This research applied direct estimation and SAE method to estimate proportion of election results in 2013 West Java governor election. Generalized linear mixed models (GLMM) approach of SAE is choosen since the data which were used to calculate the proportion is count data. The results show, the SAE generally better than direct estimation for relatively small sample size by MSE criterion.
Keyword: quick count and small area estimation, MSE, GLMM

Judul: Apatite Growth Optimation on Chicken Mucouse by Fourier Transform Infrared (FTIR) Characterization
Abstrak: Some experiment had been conducted to grow apatite from supersaturated solution of calcium phosphate ions on chicken mucouse. The calcium and phosphate ions were originated from Ca(NO3)2 and (NH4)2HPO4. Carbonate ions from (NH4)2CO3 was also used as starting solution. Experiment was carried out within about 5 hours at temperature 370 C and pH 7. Value of Ca+ : PO4 3- was 1.67, while molar ratio of CO3 2- : PO4 3- was 0.5 : 1. Molarity of molar ratio CO3 2- : PO4 3- variated approximately 0.15 : 0.30, 0.51 : 1.02, and 0.90 : 1.80. Mass of mucouse powder was constant 0.75 gram. The analysis result of Fourier Transform Infrared (FTIR) showed that the precipitation was apatite carbonate type A and B. In these experiment it was found out that the mucouse reduce the crystallinity of apatite precipitant, and the growth of apatite crystal was optimum at solution with molar ratio CO3 2- : PO4 3- about 0.15 : 0.30.
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