Thank you very much for your help, Rick. I tried the function GetArgList that you proposed in your blog and it worked fine. I am very surprised that the use of such elementary functions in IML is so complicated. In some cases, for example for such simple functions like STD or CV, the programming "by hand" is easier to read than the three steps "GetArgList --> Creation of Macro Variable --> Use of SAS-Base function with macro variable". But as more base functions are available in higher SAS versions, it seems that SAS is working on that topic. Thank you and best regards, saibot
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