I want to compare two variables and return 'true' if they are equal within a specified tolerance, otherwsie 'false', and return 'false' if one of them is missing but 'true' if they are both missing. Is there an easy way to do this in a data step? x y f(x,y) 0.5000000 0.5000001 TRUE 0.5000000 . FALSE . . TRUE
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