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st: choosing parametric model

From   "Yusvita Triwiadhian S." <>
To   statalist <>
Subject   st: choosing parametric model
Date   Fri, 1 Jul 2011 11:51:50 +0700

Dear All,

Parametric models in survival specifies a particular shape for the
hazard rate i.e the time dependency, maybe exponential,weibull, etc..
How do we choose the correct parametric model to assume about the
shape of the time dependency?
can I use AIC by comparing the AIC scores for different parametric
models and then the smallest is better? if "yes", The AIC scores that
is used when there are no covariates or when there are covariates?
which one is better?

thank you very much..

Best regards
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