specifies the variable that the procedure uses to form BY groups. You can specify
more than one variable. If you do not use the NOTSORTED option in the BY
statement, then the observations in the data set must either be sorted by all the
variables that you specify or be indexed appropriately. Variables in a BY statement
are called BY variables.
Optional Arguments
DESCENDING
specifies that the observations are sorted in descending order by the variable that
immediately follows the word DESCENDING in the BY statement.
NOTSORTED
specifies that observations are not necessarily sorted in alphabetic or numeric order.
The data is ...
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