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SAS FAQ
How do I analyze survey data with a repeated systematic sampling design?

This example is taken from Levy and Lemeshow's Sampling of Populations.

page 109 repeated systematic sampling
This example uses the wloss2 data set.

NOTE:  The PSUs are listed on the cluster statement in SAS.  Also, the coloring in the (enhanced) program editor window does not work properly with the cluster statement, so don't think that you have specified the statement incorrectly just because the keyword "cluster" does not  turn blue.

proc surveymeans data = wloss2 n = 54 sum std mean;
  weight wt1;
  cluster cluster;
  var xi;
run;

The SURVEYMEANS Procedure

            Data Summary

Number of Clusters                 6
Number of Observations            18
Sum of Weights                   162

                               Statistics

                               Std Error
Variable            Mean         of Mean             Sum         Std Dev
------------------------------------------------------------------------
XI              4.500000        0.530548      729.000000       85.948822
------------------------------------------------------------------------

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