I have noticed that when using the proc phreg in SAS and the coxph in R in the same data, the model should be different in order to get the same results. In proc phreg I model the time with the censor variable (where censor=1 means the patient withdrew from the study) in order to obtain a HR. In R I use the same model but this time censor=1 means the patient experienced the event, in order to obtain the same HR. Is there a difference in the definition of the censor variable or the models are different?
No the choice of 0,1 meaning is arbitrary. The conclusions will be the same either way, though the output may look a little different, perhaps. Best, D. Booth BTWConsult the documentation to see what each package does if you have questions. You should always get the same interpretaion of the Kaplan-Meier plot each way.
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