Hello, Can someone tell me why I am getting the following warning? proc power; twosamplesurvival curve("23")= (119 127 197 1115 1321 1391) : (0.938 0.875 0.813 0.75 0.688 0.625) curve("411")= (56) : (0.928) groupsurvival="23"|"411" totaltime=4185 test=logrank accrualtime=1 alpha=0.05 npergroup=16 14 power=.; run ; WARNING: The magnitude of the effect is ill-defined in 2 scenarios in the output table. My goal is to compare 2 survival curves, one with 6 deaths (n = 16 total) and one with 1 death (n = 14 total), the total time is 4185 minutes. SAS does do the analysis but this is my output: Computed Power Index N per Group Power Error 1 2 16 . Invalid input 14 . Invalid input I am using SAS University edition. Thank you in advance! Andrea
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