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
wrote:
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> 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 thatare
> larger in controls, compared to patients, which seems consistent with > qdec. Any ideas? Thanks for all the help. > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- 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> Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu>
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