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st: Re: Anova of clustered data


From   Paul Fenner <paulfenner@hotmail.co.uk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Re: Anova of clustered data
Date   Tue, 19 Feb 2008 09:46:25 +0000

I have an experiment in which a wire is drawn through a bracket and the load is measured as a function of time over a constant time period. This is repeated for 25 different wires in each bracket and there are 5 brackets, and I want to see if the brackets are different. Ideally the load should be independent of time but it fluctuates due to the nature of the experiment - friction etc.
I am concerned that for each wire the loads may not be strictly independent and that the data should be treated as clustered for each wire. 
I could not firure out how to allow for this in an anova desighn so I used a t-test with the vce(cluster) option for all possible combinations and then multproc and smileplot to analyses the multiple comparisons.

Is there a better (more efficient) way of carrying out this analysis?
Thanks,
Paul
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