Hi,
I have two strata output from proc lifetest. How can I calculate a single confidence interval from both results from the Survival Standard Error in the two tables below?
A confidence interval for what? What is the population parameter for which you want an interval estimate? Can you get PROC LIFETEST to give you a point estimate for that parameter?
The pointwise confidence limits for the survival function are in the OUTSURV= dataset. This is an option on the PROC LIFETEST statement.
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