data Margin;
set CAT_SORT;
if Good = "A" THEN
Margin = 10*Unit;
if Good = "B" AND
"01/01/2001"<=Date<="31/01/2001" THEN
Margin = 20*Unit;
IF Good = "B" AND
"01/02/2002"<=Date<="28/02/2002" THEN
Margin = 30*Unit;
RUN;
Is there a change that you could suugest so that I use Good="B" once only , tha is, use the IF only once.
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