Dear Rick,

Thank you for your prompt response on my previous question. The update you made cleared up the concern. Thank you.

If you don't mind me asking, does Weibull AFT model parametrization in PROC LIFEREG involve any kind of transformation of the parameters that are being estimated, such as R does given in this documentation (https://cran.r-project.org/web/packages/SurvRegCensCov/vignettes/weibull.pdf)?
I've been trying to figure out interchangeability between model formulation (log linear model) vs. likelihood construction ((hazard^indicator)*survival) of Weibull AFT model for a survival outcome.
I didn't think I saw any detail regarding this within SAS documentation for PROC LIFEREG. Would much appreciate if you have any thoughts to share on this matter.

Thank you,
Soo Kyung