Menurut Sugiyono (2001: 58) teknik ini digunakan bila populasi mempunyai anggota/unsur yang … 25/04/2011 7 Tipe-Tipe Teknik Sampling • Teknik Sampling Random (Probability Sampling) – Simple Random Sampling STRATIFIED RANDOM SAMPLING •In the case of Proportionate STRS - Determine the proportion of each stratum in the study population-p = elements (#) in each stratum total pop. Proportionate Stratified Random Sampling Cluster Sampling Non Probability Sampling Sampling Purposif Sampling Kuota Sampling Aksidental Sampling Jenuh Snowball Sampling. Stratified random sampling. From within each stratum, uniform random sampling is used to select a per-stratum sample. 47 Disproportionate Stratified Sample Stratified Random Sampling Stratified random sample – A method of sampling obtained by (1) dividing the population into subgroups based on one or more variables central to our analysis and (2) then drawing a simple random sample from each of the subgroups Reduces cost of research (e.g. Stratified random sampling is a type of probability sampling technique [see our article Probability sampling if you do not know what probability sampling is]. Application of proportionate stratified random sampling technique involves determining sample size in each stratum in a proportionate manner to the entire population. This sampling method is also called “random quota sampling". 2/24/2017 7 13 Stratified Sampling Used to assure that the strata in a population are fairly represented in the sample Especially important when the distinguishing factors (strata) are related to what is being studied Steps to follow Members of each strata are listed separately A random sample from each strata is selected 14 Stratified Sampling Considerations * Probability sampling includes: Simple Random Sampling, Systematic Sampling, Stratified Random Sampling, Cluster Sampling Multistage Sampling. Final members for research are randomly chosen from the various strata which leads to cost reduction and improved response efficiency. Stratified random sampling adalah suatu teknik pengambilan sampel dengan memperhatikan suatu tingkatan (strata) pada elemen populasi. For example, let’s say you have four strata with population sizes of 200, 400, 600, and 800. size •Determine the number of elements to be selected from each stratum = (n) x (p) •Select the required number of elements from each stratum with SRS technique. Stratified random sampling is a type of probability sampling using which researchers can divide the entire population into numerous non-overlapping, homogeneous strata. A simple random sample of elements is chosen independently from each group or subset. Proportionate Stratified Random Sampling Margono (2004: 126) menyatakan bahwa stratified random sampling biasa digunakan pada populasi yang mempunyai susunan bertingkat atau berlapis-lapis. Example of proportional allocation If N1=100 N2=300 n=40 Then A comparison between simple random sampling and stratified sampling Example: Population: Weights of … All per-stratum samples are combined to derive the “stratified random … Dalam stratified random sampling elemen populasi dikelompokkan pada tingkatan-tingkatan tertentu dengan tujuan pengambilan sampel … In proportional stratified random sampling, the size of each stratum is proportionate to the population size of the strata when examined across the entire population. This means that each stratum has the same sampling fraction. * DRAWING SIMPLE RANDOM SAMPLING Use random # table Assign each element a # Use random # table to select elements in a sample. Elemen populasi dibagi menjadi beberapa tingkatan (stratifikasi) berdasarkan karakter yang melekat padanya. * STRATIFIED SAMPLING The parent population is divided into mutually exclusive and exhaustive subsets. Stratified sampling can be divided into the following two groups: proportionate and disproportionate. An alternative sampling method is stratified random sampling (SRS), where the population is partitioned into subgroups called “strata”.