Hi, I would like to know what is the correct way to write or in other words use AND OR NOT operators in SAS? Let's us suppose we have 3 variables with names A B C in a dataset /*which way of syntax is correct*?*/ if missing(a) or missing(b) and missing(c) then..... is this correct? or if (missing(a) or missing(b)) and missing(c) then......is is correct, meaning with the parenthesis? another condition: if missing(a) and missing(b) and missing(c) then......is this correct? or if (missing(a) and missing(b)) and missing(c) then...is is correct, meaning with the parenthesis? Please clarify the need for parenthesis. Thanks
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