[R] AFT model time-dependent with weibull distribution

JPF xpfenech at gmail.com
Sun Aug 21 03:41:26 CEST 2011


question 2

*aftreg vs. survreg*

for aftreg = S0 *{t/exp(b-BXi)]^a}   a= shape and b= log(scale) 

for survreg and stata S0 *{t*exp(intercept+BXi)]^1/p} p=shape

/intercept, log(scale) and estimates are equivalent with reversed sign./ 

*PH and AFT* 

/phreg.Bhat= aftreg.Bhat * shape /   







--
View this message in context: http://r.789695.n4.nabble.com/AFT-model-time-dependent-with-weibull-distribution-tp3755079p3757871.html
Sent from the R help mailing list archive at Nabble.com.



More information about the R-help mailing list