The value displayed is actually sign(effect)*log10(p), which I think
answers both of your questions
doug
> thresholded) in terms of the corresponding *t*-value instead, would
On 02/04/2014 01:00 PM, Tudor Popescu wrote:
> Thanks Doug. I only now gather that the statistical maps are displayed
> in terms of the negative common (base 10) logarithm of the p-value.
> Two questions:
> 1) I'm probably wrong here, but if they were displayed (and
> that not be more convenient since you could also see at a glance the
> direction of the effect (i.e. whether group A or B has the greater
> thickness), rather than having to check the group means in the output
> files of the design?
> 2) given that p-values lie between 0 and 1, -log10(p) should be
> between 0 and infinity. How come, then, that the colour-bar also shows
> negative values?
>
> Tudor
>
>
> On 4 February 2014 17:09, Douglas N Greve <greve@nmr.mgh.harvard.edu
> <mailto:Freesurfer@nmr.mgh.harvard.edu>> <mailto:greve@nmr.mgh.harvard.edu>> wrote:
>
>
> You have the "Min" set to 2 which means that you are not seeing
> cluster
> less significant than p=.01. Try setting it to 1.3 (p=.05)
> doug
>
> On 02/02/2014 01:55 PM, Tudor Popescu wrote:
> > Dear Freesurfer experts,
> >
> > I ran a QDEC analysis for structural data and found, after
> Monte-Carlo
> > correction@0.05, one significant cluster, annotated as "postcentral"
> > (see screenshot attached). The stats associated with it are
> displayed
> > in the terminal, however the statistical map on the template
> brain is
> > blank.
> >
> > Also, when I press the "Find Cluster and Go To Max" button, I
> receive
> > an error that no stats can be generated for that cluster.
> >
> > Not sure if it's relevant, but my dependent variables of interest in
> > this analysis were thickness and local gyrification index (lGI). It
> > seems I'm getting the above problem only when lGI is the DV, and
> > whether or not there is a group factor among the categorical
> > predictors. I do have, however, lGI analyses where the significant
> > cluster shows up fine both on the template and in the terminal
> window.
> >
> > Can anyone help? Many thanks in advance!
> >
> > Best wishes,
> > Tudor
> >
> >
> > _______________________________________________
> > Freesurfer mailing list
> > Freesurfer@nmr.mgh.harvard.edu
> > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer> greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>
>
> --
> Douglas N. Greve, Ph.D.
> MGH-NMR Center
> Phone Number: 617-724-2358> <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting>
> Fax: 617-726-7422
>
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--
Douglas N. Greve, Ph.D.
MGH-NMR Center
greve@nmr.mgh.harvard.edu
Phone Number: 617-724-2358
Fax: 617-726-7422
Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
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