If this is what you mean by "trace", you would normally add PUT statements to a DATA step. For example, after the DATA statement, add:
put '#1 ' _all_;
After the INPUT statement, add:
put '#2 ' _all_;
After the LOSS= statement, add:
put '#3 ' _all_;
If you are dealing with large numbers of observations, you might want to limit the number of messages you get. For example, yo u might limit the number of observations read in using OBS=, or you might condition the PUT statements by adding:
If _n_ < 10 then put ......;
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