Yes, all ANOVAs are linear models. You just have to figure out what contrast matrix (or matrices) implement the hypothesis to test.
Sasha Wolosin wrote:
Is it possible to run an ANOVA or multiple linear regression in freesurfer?
Doug Greve greve@nmr.mgh.harvard.edu 4/25/2006 11:17 am >>>
Still valid.
Sasha Wolosin wrote:
Is running a t-test contrast still valid if I don't have equal
numbers
in the four groups (Male Treatment, Male Control, Female Treatment, Female Control) or should I be running an F test instead?
Sasha
Doug Greve greve@nmr.mgh.harvard.edu 4/14/2006 3:18 pm >>>
Yes, you just need to come up with the the contrast matrix taht tests
what you want to test. If the contrast matrix has one row, then it's
a
t-test. If there are more than one, then it's an F test. You example
is
actually a t-test, I think, just:
(MaleTreatment-MaleControl) - (FemaleTreatment-FemaleControl)
for a contrast of: +1 -1 -1 +1
doug
Sasha Wolosin wrote:
Dear FreeSurfers,
I am interested in examining interaction effects between two sets
of
classes where each covers all the data, let's say Male/Female and Treatment/Control. I know mri_glmfit can be used to run t-test comparisons between groups (e.g. All Treatment vs. All Control , or
Male
& Control vs. Male & Treatment), but can mri_glmfit be used to
examine
interaction effects between these two sets of classes (for surface data)?
my FSGD file looks like this: GroupDescriptorFile 1 Class MaleTreatment Class MaleControl Class FemaleTreatment Class FemaleControl Input subjid1a MaleTreatment Input subjid1b FemaleTreatment Input subjid2a FemaleControl Input subjid2b MaleControl etc...
Thanks, Sasha
Sasha Wolosin Research Assistant Developmental Cognitive Neurology Kennedy Krieger Institute 707 N. Broadway Baltimore, MD 21205 ph: (443) 923-9270 wolosin@kennedykrieger.org
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