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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