Hi Nasim, I don't use SPSS, so I'm not sure I can help, but I think what you have is right but you'll need another factor which is ICV*group. The Xg.dat file contains the design matrix for QDEC, so you might be able to compare it to what you get for SPSS
doug On 1/8/13 3:05 PM, Maleki, Nasim wrote: > Hi list, > > I have done an analysis using QDEC and now I would like to do set up similar > statistical analysis in SPSS on some parcellated structures. > > I have the following setup in QDEC: > > 2 cohorts (patients, healthy control subjects) > Continuous variable : demeaned Age > Nuisance Factor: demeaned intracranial volume > DODS > > I'm interested in the effect of age i.e. "differences in the thickness-age > correlation between the patients and healthy subjects" . Now my question is > if I the following set up would be correct for doing the stats on slopes in > SPSS: > > Univariate General Linear Model > Dependent variable: ROI > Fixed Factor: group (i.e. patient or healthy control) > Covariate: demeaned age AND demeaned intracranial volume > > and then I also add an interaction term of demeaned_age*group to be the > equivalent to the difference between thickness-age correlation in patients > vs. healthy subjects that I have in QDEC. Is this correct? > > Thanks, > Nasim > > > > _______________________________________________ > 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.
