R users,

 

I am making model selection with an accelerated failure time model using the
command survreg within the library survival.

 

As I want to compare models with different probability distributions I need
to have the full likelihood.

 

How can I find out what survreg generates: the full likelihood or a
likelihood with "unnecessary" constants dropped?

 

Example I want to compare the likelihoods in Fit1 and Fit2. Is it
straightforward, or should I e.g. add a syntax asking for the full
likelihood?

Fit1<-survreg(Surv(Time, Event) ~ x, data, dist='weibull')

Fit2<-survreg(Surv(Time, Event) ~ x, data, dist='loglogistic')

 

Ullrika


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