proc append base=dsn1 data=dsn2;
run;
https://support.sas.com/resources/papers/proceedings/pdfs/sgf2008/085-2008.pdf
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Statsitics, Research Methods, SAS, R, HLM, Rasch model
proc append base=dsn1 data=dsn2;
run;
https://support.sas.com/resources/papers/proceedings/pdfs/sgf2008/085-2008.pdf