Thanks to Dan Klein for his response to my question. As it happens, the dataset I am currently working on (and which provoked my question) is, in fact, set as flong, so his approach works.
Yulia Marchenko's solution applies to all -mi- formats and has the advantage of being built-in.
Many thanks to both.
Clyde Schechter
Dept. of Family & Social Medicine
Albert Einstein College of Medicine
Bronx, NY, USA
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