Hi, Starz.
I think your code has 0 as the censored value when you really want it as your event value since you are estimating time to transition from 1 to 0.
https://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/viewer.htm#statug_lifetest_sect002.htm
For the observation with the missing value, does the missing value indicate that you don't know its status (0 vs. 1) at 16 weeks? I'm wondering if it is really a censored observation (i.e., a 1) in disguise. If you really don't know its status at 16 weeks, can you find out its status at 15 weeks, etc.? Methods like KM allow you to use as much information as you have about each observation, even if they dropped out before the study period ended, and therefore save you from discarding observations unnecessarily.
Ray
(edited to fix a typo)
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