lol. I have, i dont know if am correct, just wanted to compare. The codes below are what i use for the first one. I am new to SAS. Thanks 1A1. proc means data=mydata.calls maxdec = 2 mean std; var duration; Cls period; run; 1C1. proc ttest data=mydata.calls; var duration; class period; run; 1C3. proc means data=mydata.calls maxdec = 2 n mean clm; var duration; class period; run;
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