Step-by-Step Programming with Base SAS 9.4

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Alternative to sorting observations

You can use an alternative method to sort observations by creating an index that identifies the observations with particular values of a variable. For more information, see Chapter 26, “SAS Data Files,” in SAS Language Reference: Concepts.

BY statement and BY-group processing

For more information, see “BY Statement” in SAS Statements: Reference and Chapter 20, “BY-Group Processing in the DATA Step,” in SAS Language Reference: Concepts.

Interleaving, merging, and updating SAS data sets

For more information, see Interleaving SAS Data Sets, Merging SAS Data Sets, and Updating SAS Data Sets.

These operations depend on the BY statement in the DATA step. Interleaving combines data sets ...