Hi, I need to calculate a confidence interval for difference betwwen two groups while the successful rate of two groups are both 100%, I used code below: data dummy_in; success1 = 'Y'; trtpn = 2; count = 67; output; success1 = 'Y'; trtpn = 3; count = 76; output; success1 = 'N'; trtpn = 2; count = 0; output; success1 = 'N'; trtpn = 3; count = 0; output; proc sort; by trtpn success1; run; proc freq data = dummy_in ; tables trtpn*success1/riskdiff(noninf cl=mn(correct=no) method=fm margin=0.1) alpha=.1 exact; weight count /zeros; run; but the outputs shows: Row or column sum zero. No statistics computed for this table. I know that the confidence interval can be computed using Miettinen and Nurminen method using R, but in sas, I cannot avoid the error of 'Row or column sum zero.' so no confidence interval can be outputed. Would anybody can help me with this problem in SAS? Thanks! Regards, Shuang
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