|The SURVEYMEANS Procedure
Primary Sampling Units (PSUs)
When you have clusters, or primary sampling units
(PSUs), in your sample design, the procedure estimates
variance from the variation among PSUs. See
the section "Variance and Standard Error of the Mean" and the section "Variance and Standard Deviation of the Total". You can use the
CLUSTER statement to identify the first stage clusters
in your design. PROC SURVEYMEANS assumes that each
cluster represents a PSU in the sample and that each
observation is an element of a PSU. If you do not
specify a CLUSTER statement, the procedure treats each
observation as a PSU.
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.