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SAS 9.4 Language Reference, Second Edition
book

SAS 9.4 Language Reference, Second Edition

by SAS Institute
December 2013
Intermediate to advanced content levelIntermediate to advanced
824 pages
24h 21m
English
SAS Institute
Content preview from SAS 9.4 Language Reference, Second Edition
Indexing for BY-Group Processing
You can also ensure that observations are processed in ascending numeric or character
order by creating an index based on one or more variables in the SAS data set. If you
specify a BY statement in a DATA step, SAS looks for an appropriate index. If it finds
the index, SAS automatically retrieves the observations from the data set in indexed
order.
Note: Because creating and maintaining indexes require additional resources, you
should determine whether using them significantly improves performance.
Depending on the nature of the data in your SAS data set, using PROC SORT to
order data values can be more advantageous ...
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Publisher Resources

ISBN: 9781629590004