Thanks Doug and how can check if the slopes are different? On Jan 12, 2014 12:33 AM, "Douglas Greve" <gr...@nmr.mgh.harvard.edu> wrote:
> > Use DODS to test whether the slopes differ between the three groups. If > they do not, then use DOSS. > doug > > > > > On 1/11/14 5:03 PM, amirhossein manzouri wrote: > > Thanks Doug for the prompt reply. I just want to if DODS is ok to be used > in my case or I should use DOSS? > On Jan 11, 2014 10:56 PM, "Douglas Greve" <gr...@nmr.mgh.harvard.edu> > wrote: > >> >> >> >> Hi Amirhossein, don't use the DOSS feature in QDEC because there is a bug >> such that >> it does not always do the right thing. Sorry, I sent out an email >> about 8mo ago on this, but it is not easy to let people know about a bug >> once the bug is out there. If you want to use DOSS, use mri_glmfit directly. >> If you still have a question, >> >> > then repost to the list. >> doug >> >> >> >> >> On 1/11/14 1:22 PM, amirhossein manzouri wrote: >> >> Hello all, >> I am using Qdec (version5.1) to study cortical thickness differences >> between groups having Age as nuisance covariate. I do not have assumption >> if the groups are different or not . Using DODS and DOSS gives me >> completely different results. We have three groups including 41, 39, and 24 >> subjects in each. >> My question is which results design matrix type is more reliable for such >> a study? And also what if I include a covariate of interest in my >> comparison? >> Thanks in advance, >> Best regards, >> Amirhossein Manzouri >> >> >> >> >> 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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