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The REG Procedure

BY Statement

BY variables ;
You can specify a BY statement with PROC REG to obtain separate analyses on observations in groups defined by the BY variables. When a BY statement appears, the procedure expects the input data set to be sorted in the order of the BY variables. The variables are one or more variables in the input data set.

If your input data set is not sorted in ascending order, use one of the following alternatives:

When a BY statement is used with PROC REG, interactive processing is not possible; that is, once the first RUN statement is encountered, processing proceeds for each BY group in the data set, and no further statements are accepted by the procedure. A BY statement that appears after the first RUN statement is ignored.

For more information on the BY statement, refer to the discussion in SAS Language Reference: Contents. For more information on the DATASETS procedure, refer to the discussion in the SAS Procedures Guide.

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