Hi Kevin,
If you want missing values to be ignored use SAS functions instead...
e.g.
if sum(a,-b)>1825 then c=1;
if sum(a,-b)<1825 then c=2;
this will then ignore the missing value and you will get your desired c=1 as your result.
This is described in the SAS documentation and in the SAS programming 1 course.
Kind Regards,
Michelle
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