Hi Doug, I just wanted to double check on what you mean. I want to run statistical models without the interaction term. When I ran a test using DOSS and co-varying for sex, age, and ICV, I chose two discrete factors (study, sex), 1 covariate (age), and 1 nuisance factor (ICV). The results I got were the same as when I ran this in SAS but with the interaction term included: model &yvar = study Sex study*sex age ICV
Is there a way in QDEC to run models without the interaction term (ex: study*sex)? Thanks! -Shannon On Fri, Aug 24, 2012 at 1:05 PM, Douglas N Greve <gr...@nmr.mgh.harvard.edu>wrote: > Hi Shannon, you can use the DOSS (different offset/same slope) instead > of DODS > doug > > On 08/20/2012 03:47 PM, Shannon Kogachi wrote: > > Hi, > > I was wondering if there is a way to run statistical tests, such as > > a 2-way ANCOVA, on QDEC but without the interaction effect. I ran a > > 2-way ANCOVA for thickness measures for a longitudinal study, and no > > interaction effect was found. Therefore, I would like to run the same > > test but without the interaction effect and see if there are other > > group effects. Please let me know if there is a way to do this in QDEC > > or any other statistical programs in FreeSurfer. Thank you! > > > > > > -Shannon > > > > > > > > _______________________________________________ > > 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: www.nmr.mgh.harvard.edu/facility/filedrop/index.html > > _______________________________________________ > 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. > >
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