The SURVEYMEANS Procedure

The WEIGHT statement names the variable that contains the sampling weights. This variable must be numeric, and the sampling weights must be positive numbers. If an observation has a weight that is nonpositive or missing, then the procedure omits that observation from the analysis. See the section Missing Values for more information. If you specify more than one WEIGHT statement, the procedure uses only the first WEIGHT statement and ignores the rest.

If you do not specify a WEIGHT statement but provide replicate weights with a REPWEIGHTS statement, PROC SURVEYMEANS uses the average of replicate weights of each observation as the observation’s weight.

If you do not specify a WEIGHT statement or a REPWEIGHTS statement, PROC SURVEYMEANS assigns all observations a weight of one.