>
> By way of a brief background, I am running this on a number of data
> sets with the aim of listing the suspect cases in a way that allows
> us to easily go back to the questionnaires to check that the
> listed value is indeed a valid entry. I would therefore want to be
> able to see the actual values of fup_pdt and fup_unit
You don't really need a loop. You may not even need a full program.
gen check=1 if fup_pdt>`x' | fup_unit=`Y' | fup_qtycoll`x' & fup_unit=`Y' & fup_qtycoll
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