The TYPES statement controls which of the available class variables PROC MEANS
uses to subgroup the data. The unique combinations of these active class variable values
that occur together in any single observation of the input data set determine the data
subgroups. Each subgroup that PROC MEANS generates for a given type is called a
level of that type. Note that for all types, the inactive class variables can still affect the
total observation count of the rejection of observations with missing values.
When you use a WAYS statement, PROC MEANS generates types that correspond ...
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