The ID statement can be used to restrict the variables
copied from the DATA= data set to the OUT= data set.
Use the ID statement to list the variables you want copied
to the OUT= data set besides
the exogenous, endogenous, lagged endogenous, and BY variables.
If the ID statement is omitted, all the variables in the
DATA= data set are copied to the OUT= data set.
- ID variables;
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