Cluster Sampling Mean Formula. Pr select cluster inN i. So total population size NM total sample size nM.
I am using three-stage cluster sampling with unequal sizes. Sampling Theory Chapter 9 Cluster Sampling Shalabh IIT Kanpur Page 3 Case of equal clusters Suppose the population is divided into N clusters and each cluster is of size M. Sample mean for the N M.
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Cluster sampling works best. - Units at each stage are selected with SRSWOR. Eg sampling clusters equally when there are a lot of small clusters and only a few very large ones could be very inefficient. Sep 07 2020 Cluster sampling is commonly used for its practical advantages but it has some disadvantages in terms of statistical validity.
