I am trying to match survival curves in JMP survival platform to the PROC LIFETEST. The estimates I get for the survival functions using the KM method are not matching. Am I looking at the wrong thing? the format of the data is the same for both (see below) The dataset I am using is from Survival Analysis using SAS , Paul Allison, output 2.1 Myelomatosis Data. Also Below is the two different sets of estimates. It is the survival columns I am comparing. I must be doing something wrong? any insight appreciated!