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Re: st: graphs - help
In response to my earlier reply about graphing comparitive baseline hazards
(one frailty, one non-frailty), Eldira <Gjoncae@aol.com> now asks:
> Many thanks for your help. It works well now but I have another question.
> You add the option alpha1 when predictiong the hazard after running the
> model with heterogeneity- predict h_frailty, hazard alpha1. Does that mean
> that you assume shared frailty?
No, I do not assume shared frailty in the model. Using the -alpha1- option
when -predict-ing gives estimates of the conditional (or individual) predicted
quantity, in this case, the hazard. If you do fit a shared frailty model,
-alpha1- becomes the default to -predict-, but you do not have to assume
shared frailty to use -alpha1-.
> In my data, I have no reason to believe that there is shared frailty. Should
> I use alpha1, unconditional or no option at all?
It depends (see my earlier post). If you want to compare individual hazards
use -alpha1-. Use -unconditional- to compare population hazards.
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