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Topic 6 - Sampling ll (in Hindi)
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Talvir Singh
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  3. 4534 34 91 04 04 ,91 95 78 64 95 17 65 49 65 Sample Population Probability Sampling

  4. Probability Sampling *Each and every unit of the population has the equal chance for selection as a sampling unit *Also called formal sampling or random sampling *Probability samples are more accurate Probability samples allow us to estimate the accuracy of the sample

  5. Types of Probability Sampling *Simple Random Sampling *Stratified Sampling Cluster Sampling Systematic Sampling Multistage Sampling

  6. Simple Random Sampling The purest form of probability sampling Assures each element in the population has an equal chance of being included in the sample Random number generators

  7. *With replacement The unit once selected has the chance for again selection *Without replacement The unit once selected can not be selected again

  8. Advantages of SRS Minimal knowledge of population needed External validity high; internal validity high; statistical estimation of error Easy to analyze data

  9. Disadvantage High cost; low frequency of usee Requires sampling frame Does not use researchers' expertise Larger risk of random error than stratified

  10. Stratified Random Sampling Population is divided into two or more groups called strata, according to some criterion, such as geographic location, grade level, age, or income, and subsamples are randomly selected from each strata Elements within each strata are homogeneous, but are heterogeneous across strata

  11. Advantage * Assures representation of all groups in sample population needed Characteristics of each stratum can be estimated and comparisons made Reduces variability from systematic

  12. Cluster Sampling The population is divided into subgroups (clusters) like families. A simple random sample is taken of the subgroups and then all members of the clusterselected are surveyed.

  13. Systematic Random Sampling

  14. Multistage Random Sampling Multistage sampling refers to sampling plans where the sampling is carried out in stages using smaller and smaller sampling units at each stage. Not all Secondary Units Sampled normally used to overcome problems associated with a geographically dispersed population

  15. Pri Clusters Secondary Clusters Simple Random Sampling within Secondary Clusters 3 3 5 6 5 8 9 10 1 6 8 13 14 15 9 10