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: [email protected] [mailto:[email protected]]On Behalf Of Paul Fenner
Sent: maandag 21 mei 2007 14:59
To: [email protected]
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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