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. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.