Statalist,
right now I am concentrating my studies on the analysis of duration
data. While working through the Stata manual (version 8) on "Survival
Analysis and Epidemiological Tables" I found and remark which I could
not understand so far. On p. 204 the manual says that the relationship
between the coefficents of a PH and an AFT Weibull model does only hold
if the ancillary parameter is a constant. It does not hold when the
ancillary parameter is parametrized in terms of covariates, e.g. using
the strata option. Can anyone explain this to me?
Thanks!
Best whishes
joerg.
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