the function  survreg 
in the package "survival" should  what are you looking for.

Cheers
Anna


----- Messaggio originale -----
Da: boshao zhang <zboshao@yahoo.com>
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


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