30 Dec
2008
30 Dec
'08
1:44 p.m.
Hello, I noticed that when you run a QDEC analysis (QDEC 1.1 in FS 4.1.0) using a "DOSS" model with 1 class (e.g., group) and 1 continuous variable (e.g., age), you still get a putative map for "Does the thickness-age correlation differ between GrpA and GrpB?" (i.e., lh-Diff-GrpA-GrpB-Cor- thickness-age). There should be no such map available for a DOSS model, and a quick check of the contrast vectors indicates that the model is really a duplicate of "Does the correlation between thickness and age, accounting for group, differ from zero?" (i.e., lh-Avg-thickness-age- Cor)
cheers, Mike H.
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Michael Harms, Ph.D.
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Conte Center for the Neuroscience of Mental Disorders
Washington University School of Medicine
Department of Psychiatry, Box 8134
Renard Hospital, Room 6615 Tel: 314-747-6173
660 South Euclid Ave. Fax: 314-747-2182
St. Louis, MO 63110 Email: mharms@wustl.edu
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