However, it may save costs on obtaining a sample. Cluster sampling is a two-step sampling procedure. It may be used when completing a list of the entire population is difficult. For example ...

The number of observations in a population, the number of observations in a sample, and the procedure used to draw the sample sets determine the variability of a sampling distribution. The ...

Prior to invoking the CATMOD procedure, structural and sampling zeros are easily identified and manipulated ... proc catmod data=Combos2; weight count; model Active*Passive=_response_ / freq pred=freq ...