Two Stage Cluster Sampling Formula. I j 1 m i y i j m i The first part of this formula is also known as the expansion estimator. So cluster sampling will be efficient if clusters are so formed that the variation the between cluster means is as small as possible while.
Sampling unit is a collection or cluster of elements. There are more complicated types of cluster sampling such as two-stage cluster. Prob 2 c a a Cluster population c Number of individuals to be sampled in each cluster 13.
Elements for survey occur in groups clusters.
There are more complicated types of cluster sampling such as two-stage cluster. Suppose the population is composed of N1 primary units and the i th primary unit contains Ni2 second-stage units i 1 2 3 N1. F ----- tween area 550 1 550 5000 00000 ----- SE un. Since simple random sampling is used in the second stage an unbiased estimator of the total y -value for the i th primary unit is.
