Mona, If NaN are simply characters that are in some fields that are otherwise numeric, I think your easiest solution would be to grab the code that proc import creates and simply modify it so that you are reading the field(s) as characters. I nice artice on that topic can be found at: http://www2.sas.com/proceedings/sugi30/038-30.pdf The article contains step-by-step instructions for accomplishing such a task.  That will also get rid of the notes. Art ... View more