Juergen Haenggi wrote:
Dear Freesurfer users
I am trying to create the GroupDescriptorFile 1 for an ANCOVA in order to
analyze local cortical thickness. I intend to compare two groups while
controlling for age and mean cortical thickness.
Am I right that I can leave out the term "class" and model group as a
variable?
Nope, you have to model it as a class. Class actually allows modeling of
both the intercept and slope separately for each group.
GroupDescriptorFile 1
Title CorticalThickness
Variables Group Age MeanThickness
Input Control01 ControlSubject 27 3.14
Input Control02 ControlSubject 31 3.28
....
Does the variables all have to be integers or can it be also a string?
Variables must be integers or decimals, they cannot be strings. The
"Variables" represent continuous values such as age, IQ, etc. Whereas
the classes represent *combinations* of discrete variables such as group
membership, gender, etc.
doug
Thanks for helping
Best regards
Juergen
-----------------------------------------------------------
Juergen Haenggi
Ph.D. (Dr. des.)
Division of Neuropsychology
Institute of Psychology
University of Zurich
Binzmuehlestrasse 14, PO Box 25
8050 Zurich, Switzerland
0041 44 635 73 97 (phone office)
0041 76 445 86 84 (phone mobile)
0041 44 635 74 09 (fax office)
BIN 4.D.04 (office room number)
[EMAIL PROTECTED] (email)
http://www.psychologie.uzh.ch/neuropsy/ (website)
http://www.juergenhaenggi.ch (private website)
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MGH-NMR Center
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