Yes, the cases "increasing perfusion and increasing test scores" and
"decreasing perfusion and decreasing test scores" are the same.
Am Samstag, den 11.11.2017, 00:41 +0330 schrieb Negar Chabi:
> Dear Dr. Glauche,
>
> If I check for the positive correlation which means increasing
> perfusion associated with increasing test scores. Do the brain
> regions obtained for this contrast equal with the regions where
> decreasing perfusion associated with decreasing test scores? If not
> how I can check for this assumption (Finding areas with this
> relationship " decreasing perfusion associated with decreasing test
> scores" )?
>
> Regards.
> Sincerely.
>
> On Fri, Nov 10, 2017 at 6:49 PM, Negar Chabi <[log in to unmask]>
> wrote:
> > Dear Dr. Glauche,
> >
> > Thank you very much for your helpful response.
> >
> > Regards.
> >
> > On Fri, Nov 10, 2017 at 4:27 PM, Volkmar Glauche <volkmar.glauche@u
> > niklinik-freiburg.de> wrote:
> > > Dear Negar Chabi,
> > >
> > > the contrast weights should be [0 1] for positive and [0 -1] for
> > > negative relationship between SPECT values and your score. To
> > > explore the results, you might want to look at the data with a
> > > less conservative threshold. Since your study includes only 21(?)
> > > subjects, it might also be worth to divide the sample by a median
> > > split and compare both groups in a two-sample-t-test without
> > > covariate.
> > >
> > > Hope this helps
> > > Volkmar
> > >
> >
> >
> >
> > --
> > Negar Chabi
> > Msc of Biomedical engineering
> > Persian Gulf Nuclear Medicine Research Center
> > Bushehr University of Medical sciences
> >
>
>
>
> --
> Negar Chabi
> Msc of Biomedical engineering
> Persian Gulf Nuclear Medicine Research Center
> Bushehr University of Medical sciences
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