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st: RE: Re: Weibull multiple comparison


From   "Maarten Buis" <M.Buis@fsw.vu.nl>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Re: Weibull multiple comparison
Date   Mon, 21 May 2007 15:22:11 +0200

One way is to estimate a single model with dummies for the different designs. 
Hope this helps,
Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology 
Vrije Universiteit Amsterdam 
Boelelaan 1081 
1081 HV Amsterdam 
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434 

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Paul Fenner
Sent: maandag 21 mei 2007 14:59
To: statalist@hsphsun2.harvard.edu
Subject: st: Re: Weibull multiple comparison

I have an experiment in which 7 different implant designs, 20 repeats for
each implant, are tested to destruction. I have used streg / weibull to fit
a model to the data and the fit is acceptable as asseseed by qweibull. My
problem is to determine if there are any significant differences between the
designs. I had considered doing all possible comparisons using the log rank
test and then smileplot for the subsequent multiple comparison.
Is this a reasonable approach or am I missing an obvious way to compare
Weibull distributions. I am using Stata 9.
Many thanks.
Paul

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