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st: AW: analysis question


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: analysis question
Date   Tue, 11 Aug 2009 14:14:31 +0200

<> 

Sounds like a case for the -cluster()- option to the VCE...



HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Nikolaos Pandis
Gesendet: Dienstag, 11. August 2009 13:36
An: statalist@hsphsun2.harvard.edu
Betreff: st: analysis question

Hi to all.

I would like to ask the following question.

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?

Any suggestions would be greatly appreciated.

Many thanks,

Nick 
 


      
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