the function survreg in the package "survival" should what are you looking for.
Cheers Anna ----- Messaggio originale ----- Da: boshao zhang <[EMAIL PROTECTED]> A: r-help@r-project.org Inviato: Mercoledì 19 marzo 2008, 10:45:43 Oggetto: [R] weibull model Dear Helpers: If you know how to fit a Weibull model using R, you are my savior for my project. The hazard ramda is specified as t^alpha * (1+a*dose*exp(-b*dose)). Or, can we modify the Cox model to capture the proportional part above? Here t is the survial time, dose is a subject received in a exposed group. Thank you a lot. Boshao ____________________________________________________________________________________ Looking for last minute shopping deals? ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Tanti modi per restare in contatto con chi vuoi. [[alternative HTML version deleted]]
______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.