If you omit name, then PROC MEANS uses the names of variables in
the id-variable-list.
Tip
Use the AUTONAME option to automatically resolve naming
conflicts.
CAUTION:
The IDGROUP syntax enables you to create output variables with the same
name. When this action happens, only the first variable appears in the output
data set. Use the AUTONAME option to automatically resolve these naming
conflicts.
Note:If you specify fewer new variable names than the combination of analysis
variables and identification variables, then the remaining output variables use the
corresponding names of the ID variables as soon as PROC MEANS exhausts the
list of new ...
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