BY Statement
- BY variables;
A BY statement can be used with PROC SIMLIN to
obtain separate analyses for groups of observations
defined by the BY variables.
The BY statement can be applied to one or both of
the EST= and the DATA= input data set.
When a BY statement is used and both an EST= and a DATA= input data set
are specified, PROC SIMLIN checks to see if one or both of the data sets
contain the BY variables.
Thus, there are three ways of using the BY statement with PROC SIMLIN:
- If the BY variables are found in the EST= data set only,
PROC SIMLIN simulates over the entire DATA= data
set once for each set of coefficients read from the BY groups
in the EST= data set.
- If the BY variables are found in the DATA= data set only,
PROC SIMLIN performs separate simulations over each BY group in the
DATA= data set, using the single set of coefficients in the
EST= data set.
- If the BY variables are found in both the EST= and the DATA= data sets,
PROC SIMLIN performs separate simulations over
each BY group in the DATA= data set using the coefficients from the
corresponding BY group in the EST= data set.
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.