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R^2 for Generalized Gamma AFT regression
R^2 for Generalized Gamma AFT regression

Hello Stata Fam,
I want to compare parametric survival models using r². I have calculated r² for Exponential, Weibull, Loglogistic and Lognormal using

Code:

str2d:

but i got error message when i tried for ggamma

Code:

unknown distribution: ggamma

. Is there any way I can get around this please? Also, what are other methods I can use to compare the models in order to know the best model for my data?

Thanks

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