If QDEC gives you that contrast, then it is the same. QDEC is a bit clunky when it comes to correctly for multiple comparisons, but it should give the same answer as mri_glmfit doug
On 10/28/2015 04:23 AM, Sandy Schramm wrote: > Dear Doug, > thanks for reply. > But isn't it statistically the same: compare e.g. the thickness > of morbid group 1 with the controll group via Qdec respectively > compare both groups via contrasts (e.g. 1 0 0 -1) in mri_glmfit? > For me the only advantage of mri_glmfit is to controll for more > variables/covariates. Are there more advantages? > Kind regards > Sandy > *Gesendet:* Dienstag, 27. Oktober 2015 um 16:27 Uhr > *Von:* "Douglas Greve" <gr...@nmr.mgh.harvard.edu> > *An:* freesurfer@nmr.mgh.harvard.edu > *Betreff:* Re: [Freesurfer] comparison of 4 groups: mri_glmfit or Qdec? > yes, use mri_glmfit > doug > > On 10/26/15 3:34 AM, Sandy Schramm wrote: > > Dear Experts, > > > > we want to compare data (thickness) of 4 groups (3 morbid groups and 1 > > controll group). Both, Qdec and mri_glmfit, will do the same analyses. > > But we are not sure, if the usage of Qdec is statistically correct in > > our case. Because in Qdec we can only compare 2 of the 4 groups. But > > Qdec is much more comfortable to handle. > > Or do you advise the mri_glmfit for our data analyses? > > > > Thanks for some advice! > > Sandy Schramm > > _______________________________________________ > > Freesurfer mailing list > > Freesurfer@nmr.mgh.harvard.edu > > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > The information in this e-mail is intended only for the person to whom > it is > addressed. If you believe this e-mail was sent to you in error and the > e-mail > contains patient information, please contact the Partners Compliance > HelpLine at > http://www.partners.org/complianceline . If the e-mail was sent to you > in error > but does not contain patient information, please contact the sender > and properly > dispose of the e-mail. > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- Douglas N. Greve, Ph.D. MGH-NMR Center gr...@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 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 https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
