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Re: st: DATA ANALYSIS QUESTION


From   Clive Nicholas <clivelists@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: DATA ANALYSIS QUESTION
Date   Sun, 23 Aug 2009 18:11:33 +0100

Nikolaos Pandis wrote:

> We have a set of 3-D images constructed from cat scans, and we are measuring volumes defined by certain anatomical points on the 3-D images.
>
> The reconstruction/measuring technique is performed using 3 new types of software and their results will be compared with the results of validated/reference technique.
>
> The same reconstructions/cat scans are used for all techniques.
>
> The objective is to see how close (do they differ significantly?) the volume values recorded by each technique are to the values recorded by the reference technique.
>
> I was thinking along the lines of regression with the volume(continuous) variable as the dependent variable and technique as the categorical dependent variable with 4 levels. The reference level would be the the standard/validated method.
>
> However, how would I account for the fact that the data is correlated since all measurements for the 4 methods are taken from the same reconstructions/scans?

-help sureg-?

-- 
Clive Nicholas

[Please DO NOT mail me personally here, but at
<clivenicholas@hotmail.com>. Please respond to contributions I make in
a list thread here. Thanks!]

"My colleagues in the social sciences talk a great deal about
methodology. I prefer to call it style." -- Freeman J. Dyson.
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