Hi, I am using PROC LIFETEST to generate the KM curve and its confidence band. I noticed that there is an option called CONFTYPE= (default is LOGLOG) which can let us choose the type of transformation to calculate the confidence band. I also tried CONFTYPE=LINEAR, and the confidence band is different. To me, the results from LINEAR makes more sense, but I am not sure if I can use it. My question is, is there any rule to choose the type of transformation? Is it related to the sample size?
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