No, I've never used SPSS. If you know matlab, I can step you through how
to do it there
On 06/25/2014 04:13 PM, Emma Thompson wrote:
> I'm using SPSS. I'm not sure if my analysis reflects exactly what qdec
> is doing, do you know which analysis in SPSS would be most
> appropriate? I'm doing a simple ANCOVA.
>
>
> On Wed, Jun 25, 2014 at 11:07 AM, Douglas N Greve
> <greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>> wrote:> <mailto:greve@nmr.mgh.harvard.edu
>
>
> what software did you use? Are you sure you are using the same
> model as
> qdec uses?
>
>
> On 06/25/2014 11:03 AM, Emma Thompson wrote:
> > Thanks Doug, yes I did control for age in both instances.
> >
> >
> > On Wed, Jun 25, 2014 at 10:14 AM, Douglas N Greve
> > <greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>
> > <mailto:Freesurfer@nmr.mgh.harvard.edu> <mailto:greve@nmr.mgh.harvard.edu>>> wrote:
> >
> >
> > Your interpretation is right (ie, controls > patients for
> > red/yellow/orange). When you compared the two groups in your
> separate
> > analysis, did you control for age?
> > doug
> >
> >
> > On 06/24/2014 02:19 PM, Emma Thompson wrote:
> > > Hi Freesurfers,
> > > I am reposting this as my last email bounced.
> > >
> > > I have conducted a DODS analysis in qdec with group
> (controls vs
> > > patients) set as my fixed factor and age as a nuisance
> variable to
> > > determine if my groups differ in cortical thickness.
> Controls were
> > > added first in the .levels file followed by patients. When I
> > view the
> > > results in the display window for "do controls differ from
> > patients in
> > > cortical thickness" I see a significant cluster for the caudal
> > > anterior cingulate, denoted by a red-orange blob and a
> positive
> > > t-value. I'm wondering if this simply means that controls had
> > greater
> > > cortical thickness compared to patients after controlling for
> > age? The
> > > reason I ask is that I'm a little confused since when I
> created
> > an ROI
> > > for this cluster using tksurfer and then extracted the
> means and
> > sd, I
> > > see that the patients actually have larger means than the
> controls,
> > > the opposite of my interpretation of the results presented by
> > the qdec
> > > display. Furthermore, if I extract the means and sds for
> the entire
> > > caudal anterior cingulate using the aparc file, I get
> means that are
> > > larger in controls, compared to patients, which seems
> consistent
> > with
> > > qdec. Any ideas? Thanks for all the help.
> > >
> > >
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> >
> > --
> > Douglas N. Greve, Ph.D.
> > MGH-NMR Center
> > greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>
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> >
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> --
> Douglas N. Greve, Ph.D.
> MGH-NMR Center
> greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>
> Phone Number: 617-724-2358 <tel:617-724-2358>
> Fax: 617-726-7422 <tel:617-726-7422>
>
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--
Douglas N. Greve, Ph.D.
MGH-NMR Center
greve@nmr.mgh.harvard.edu
Phone Number: 617-724-2358
Fax: 617-726-7422
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