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The NLP Procedure

BY Statement

BY variables ;

A BY statement can be used with PROC NLP to obtain separate analyses on DATA= data set observations in groups defined by the BY variables. That means, for values of the TECH=option other than NONE, an optimization problem is solved for each BY group separately. When a BY statement appears, the procedure expects the input DATA= data set to be sorted in order of the BY variables. If the input data set is not sorted in ascending order, it is necessary to use one of the following alternatives:

For more information on the BY statement, refer to the discussion in SAS Language Reference: Concepts. For more information on the DATASETS procedure, refer to the discussion in the SAS Procedures Guide, Version 6.

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