January 2018
Beginner to intermediate
582 pages
25h 3m
English
Content preview from SAS Certification Prep Guide, 4th Edition
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Group Processing Using the BY Statement
Like the CLASS statement, the BY statement specifies
variables to use for categorizing observations.
|
Syntax, BY statement:
BY variable(s);
|
But BY and CLASS differ
in two key ways:
-
Unlike CLASS processing, BY-group processing requires that your data already be sorted or indexed in the order of the BY variables. Unless data set observations are already sorted, you must run the SORT procedure before using PROC MEANS with any BY group.CAUTION:If you do not specify an output data set by using the OUT= option, PROC SORT overwrites the initial data set with newly sorted observations.
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The layout of BY-group results differs ...
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