[R] AFT model time-dependent with weibull distribution

[JPF]

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 /   







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