Ok, that's great. Thanks very much for your help.
Best wishes and Merry Christmas!
Qi Zhu, PostDoc
Laboratorium voor Neuro- en Psychofysiologie
K.U.Leuven Medical School
Herestraat 49, B-3000 Leuven (Belgium)
On Wed, Dec 21, 2011 at 7:40 PM, Douglas N Greve
wrote:
> Yes that is correct. That wa
Yes that is correct. That was fixed with version 5.1 so current
distributions do the right thing.
doug
Qi Zhu wrote:
> Yes, seems weird. The image that I attached to you in the first mail
> is actually a t map, so the t value in those areas are also zero.
> And according to what I read from fast_
Yes, seems weird. The image that I attached to you in the first mail
is actually a t map, so the t value in those areas are also zero.
And according to what I read from fast_selxavg3.m, the t value is
actually calculated from the fsig, which is: t.vol =
sqrt(fsig.vol).*sign(ces.vol), and fsig.vol i
The t is computed as the signed square root of the F (not Fsig) volume:
t.vol = sqrt(Fvol.vol) .* sign(ces.vol);
The Fvol (and do t) is not computed from the sig (the other way around).
Are you sure that the t-value does not look right in those areas?
doug
Qi Zhu wrote:
> Dear Doug,
>
> Thank
Dear Doug,
Thanks very much for your prompt response. I tried what you suggested
and the sig map looks fine now, that's probably the best that we can
get for the sig map, because of the limitation of the MATLAB I guess.
But for the t map, the values are still not correct for those voxels
that high
btw, if you simply "touch" the contrast mat files in the analysis
directory, it will only regenerate the contrasts. That should save you
some time because it won't have to re-run all of selxavg.
doug
Douglas N Greve wrote:
> I think this is due to the high DOF and probably high t-value causing
I think this is due to the high DOF and probably high t-value causing
the significance in matlab to be computed as 0. This gets converted to
Inf (infinity) when the -log10(p) calculation is made, then the Inf gets
set to 0 when the volume is saved. The quick fix for you is to change
fast_selxav
