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st: RE: Re: Weibull multiple comparison

From   "Maarten Buis" <>
To   <>
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 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

-----Original Message-----
From: []On Behalf Of Paul Fenner
Sent: maandag 21 mei 2007 14:59
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.

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