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When coding for loops in SAS, one neat thing to remember is that all of the parts of it are optional. start <TO stop> <BY increment> <WHILE(expression) | UNTIL(expression)> http://support.sas.com/documentation/cdl/en/lrdict/62618/HTML/default/a000201276.htm So in another language, what might be for(int i=0;i < max;i++) { In SAS, you can leave out the “by 1″, since it’s the default [...]