The ID variable is used to identify the objects (leaves) in the tree on
the output. The ID variable can be a character or numeric variable of
any length. If the ID statement is omitted, the variable in the NAME
statement is used instead. If both the ID and NAME statements
are omitted, PROC TREE looks
for a variable called _NAME_. If the
_NAME_ variable is not found
in the data set, PROC TREE issues an error message and stops. The ID
variable is copied to the OUT= data set.
- ID variables ;
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