If the TRANSFORMOUT=(CUGMEAN) operation is specified on the CONVERT
statement, then PROC EXPAND will terminate with either a Read Access
Violation or a Segmentation Violation.

To circumvent the problem, use the TRANSFORM= option rather than the
TRANSFORMOUT= option.  For example, specify:

   proc expand data=a out=b;
     id date;
     convert x=geomean_x / transform=(cugmean);
   run;

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