Hello freesurfer experts
I would like to know how to get in freesurfer corrected p-values and t-statistics for the FDR analysis and corrected t-statistics for the clusters in the cluster size inference by permutation testing.
In advance thank you very much
Jorge Luis
Hello Jorge, There is no such thing as a "corrected p-value" for a FDR analysis. FDR returns a p-value threshold (for the original vertex or voxel-wise p-values) such that if you threshold the data at that p-value, you can expect on average that the fraction of false-positive vertices will be equal to the "false discovery rate" (i.e., "q" value) that you selected for the analysis.
cheers, Mike H.
On Wed, 2009-10-21 at 01:09 -0700, jorge luis wrote:
Hello freesurfer experts
I would like to know how to get in freesurfer corrected p-values and t-statistics for the FDR analysis and corrected t-statistics for the clusters in the cluster size inference by permutation testing.
In advance thank you very much
Jorge Luis
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
The FDR is done through the tksurfer interface. Select the desired FDR, hit the button, and it sets the vertex-wise threshold needed to realize that FDR.
For the permutation, it is done similar to the other simulations. See the tutorial.
doug
jorge luis wrote:
Hello freesurfer experts
I would like to know how to get in freesurfer corrected p-values and t-statistics for the FDR analysis and corrected t-statistics for the clusters in the cluster size inference by permutation testing.
In advance thank you very much
Jorge Luis
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
freesurfer@nmr.mgh.harvard.edu
-
Douglas N Greve -
jorge luis -
Michael Harms