When you have multiple table requests in a single PROC SURVEYFREQ step
and there are missing values in any of the analysis variables, the
procedure will report incorrect results for each of the tables.

The only circumvention is to split the tables into multiple PROC
SURVEYFREQ steps.  For example, you would need to split:

   proc surveyfreq;
      tables a*(b c);
   run;

into

   proc surveyfreq;
      tables a*b;
   run;

   proc surveyfreq;
      tables a*c;
   run;

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