R^2 for Generalized Gamma AFT regression

[Solomon Okon]

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

str2d:

but i got error message when i tried for ggamma

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

[Maarten Buis]

R² is more a measure for linear regression. AIC and BIC are measures that apply more generally. To compute those, see help estimates stats

[Solomon Okon]

Thank you Sir Maarten Buis. Please, are there other performance measures I can use apart from AIC and BIC? I want to use more than one performance measure.

Thanks