The "CONDITION" variable in P1F

   Any cross-tabulation problem requires you to specify ROW and COLumn
variables. These two specifications are sufficient to analyze the relation-
ships among those variables.  However, sometimes you may want a "cross section"
of the data, to see what relationships exist at each level of a third variable.

  An example is the use of income categories to examine the relation between
education and self-image at each income level.  Or, we could examine the
relation between education and self-image for each sex classification.
Both income and sex could be specified as "condition" or "level" variables
for these cross-sections of the results.

  Using sample data, try the use of sex membership as a third variable
to see its effect upon the results.

  If you don't want this option, just use the RETURN key alone.