Dear Yanjun,
> Thanks for your suggestion. How do you think about changing the Degree of
> Freedom for T test to the equivalent higher value in SPM.mat? The DOF should
> be much bigger after pooling the variance. Could you give some suggestion on
> how to calculate an equivalent DOF? Thanks a lot.
The easiest thing to do would be to print out your SPM results table as usual,
from the Z transformed image, and then derive the corrected thresholds for Z
statistics with my vol_corr code, using the analysis mask.img as the definition
of the volume, and Z field as the type of statistic.
http://www.mrc-cbu.cam.ac.uk/Imaging/vol_corr.html
ftp://ftp.mrc-cbu.cam.ac.uk/pub/imaging/Corr_p/corr_p.tar.gz
This doesn't get round the need to know the correct smoothness value of
course.
Best again,
Matthew
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