I am using SAS Studio   variables are fertility and pcturban   I need to graph log(ferility)*pcturban, but SAS  is reading log as a variable, which I don't have.   proc plot data=UN112; plot log(fertility)*pcturban; run; proc reg data=UN112; model log(fertility)=pcturban; run;  Log function does not highlight blue in SAS Studio.   ERROR: Variable LOG not found. NOTE: The previous statement has been deleted. ERROR 22-322: Syntax error, expecting one of the following: a name, ;, -, /, :, _ALL_, _CHARACTER_, _CHAR_, _NUMERIC_, {. ERROR 200-322: The symbol is not recognized and will be ignored.   ... View more