| BY-Group Processing in SAS Programs |
BY-group processing is a method of processing
observations from one or more SAS data sets that are grouped or ordered by
values of one or more common variables. You can use BY-group processing in
both DATA and PROC steps.
The most common use of BY-group processing in the DATA step is
to combine two or more SAS data sets by using the BY statement with a SET,
MERGE, MODIFY, or UPDATE statement. When you create reports or summaries with
SAS procedures, BY-group processing allows you to group information in the
output according to values of one or more variables.
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