Hi - if you're honestly considering only part of the brain then you
can restrict the mask that you feed into randomise, and then the
multiple comparison correction will become less severe.
Cheers.
On 31 Aug 2007, at 15:47, Ethan J wrote:
> Hello,
>
> Unfortunately I did not see any significant voxels for the
> tbss_max_tfce_tstat1 at p0.05 or for the FWE voxelwise corrected
> ouput. Is it valid to interpret results from voxelwise uncorrected
> output - especially if you using only a part of the skeleton
> instead of the entire skeleton to do your analysis - more sort of a
> ROI analysis?
>
> Thanks,
> EJ
>
> Steve Smith <[log in to unmask]> wrote:
> Hi,
>
> On 28 Aug 2007, at 16:47, Ethan J wrote:
>
> > Hello,
> >
> > I have a set of TBSS results for 14 subjects. After running the
> > randomise option to evaluate correlations of FA with some
> > behavioral measure, I am trying to make sense of the results. I
> > used the TFCE option and I have two sets of TFCE outputs -
> > tbss_tfce_tstat1 & tbss_max_tfce_tstat1.
> > How do I interpret these results? For the tbss_max_tfce_tstat1, the
> > values represent FWE corrected p values?
>
> That's right, and tbss_tfce_tstat1 is the raw TFCE-enhanced image
> (i.e. not p-values at all)
>
> > So should I used the regular min 0.949 max 1 setting to interpret
> > my results?
>
> Yes. Did it work?
>
> Cheers.
>
>
> > Wht do the voxel values in the tbss_tfce_tstat1 mean?
> >
> > Thanks,
> > EJ
> >
> > Be a better Globetrotter. Get better travel answers from someone
> > who knows.
> > Yahoo! Answers - Check it out.
>
>
> ----------------------------------------------------------------------
> --
> ---
> Stephen M. Smith, Professor of Biomedical Engineering
> Associate Director, Oxford University FMRIB Centre
>
> FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
> +44 (0) 1865 222726 (fax 222717)
> [log in to unmask] http://www.fmrib.ox.ac.uk/~steve
> ----------------------------------------------------------------------
> --
> ---
>
>
> Boardwalk for $500? In 2007? Ha!
> Play Monopoly Here and Now (it's updated for today's economy) at
> Yahoo! Games.
------------------------------------------------------------------------
---
Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
------------------------------------------------------------------------
---
|