Hi all, It seems that the post below is the case for both QDEC1.2 and 1.4, but only when you have two discrete variables with cases labeled as "1" and "2" in both.
Cheers, Dominic On 28/1/11 1:58 PM, "Dominic Dwyer" <dwy...@unimelb.edu.au> wrote: > Dear developers, > > I recently found that if you have two discrete variables in QDEC, then the > order in which you select them in the design tab drastically effects results. > It appears that the selection dictates the definition of the covariate. > > In particular, regardless of the comparison you choose to view in the display > tab (i.e. "Does the average thickness, accounting for X, differ between 1 & 2" > OR "Does ..., accounting for Y, differ between 1 & 2") the results depend on > what you click in the design tab rather than these definitions. > > Is this correct? If so, then how do we verify that the contrast that we think > we're testing is correct? Should we just not use QDEC 1.2 and set up the > models manually? > > Many thanks for your help. > > best, > > Dominic > > PS. I suspect that this problem has been fixed in the new version, but it > wouldn't work with our data which has been processed with FS4.5. On this note, > is there a way that around this to use FS4.5 images with the new QDEC? > > _______________________________________________ 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.
