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Done correctly, this is a form of random sampling: • Population is divided into groups, usually geographic or organisational • Some of the groups are randomly chosen • In pure cluster sampling, whole cluster is sampled. • In simple multistage cluster, there is random sampling within each randomly chosen cluster. Population is divided into groups: • Some of the groups are randomly Advantages and disadvantages of random sampling pdf the sample random sampling. For these reasons, stratified sampling is very popular in practice. Let U h = f1; ;N hgbe the indices in the population elements in stratum h and let y hi denote the measurement of study item y for unit i in stratum h. The population total Y = åH h=1 Y h is the sums of the stratum totals Y h = N h i=1 y hi. The HT estimator of Y is the sum of the HT estimator of Y