Hi Doug, I am trying to implement something like the MS/CN conjunction suggested by Nichols. For that, I am finding the voxels that show a significant effect at a given threshold in both contrast maps. I have one question about the resulting p-value. In principle, I would tend to think that the conjunction p-value is p-value of contrast1 x p-value of contrast 2, e.g., 0.05*0.05=0.0025. However, one could also think that it is the max of the two p-values. Which one is correct? Thanks, Caspar
2013/5/23 Douglas N Greve <gr...@nmr.mgh.harvard.edu>: > Hi Caspar, I think the 4.x should be the same as 5.x. I'm not sure about > your fsfast question. There is nothing to automatically do it (ie, > you'll need to run mri_concat) > doug > On 05/23/2013 03:06 PM, Caspar M. Schwiedrzik wrote: >> Hi! >> I am trying to do a conjunction analysis using mri_concat --conjunct >> with 2 to three sig.nii as input. >> It seems to me that the resulting map is what Nichols et al. refer to >> as MS/GN, i.e., a test against the global null (at least one effect). >> Is that correct, and does that depends on v4.5 / 5.x? >> Is there something in FSFAST that would allow me to do a "real" >> conjunction, that is, all effects significant in a given voxel? >> Thanks, Caspar >> _______________________________________________ >> Freesurfer mailing list >> Freesurfer@nmr.mgh.harvard.edu >> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >> >> > > -- > Douglas N. Greve, Ph.D. > MGH-NMR Center > gr...@nmr.mgh.harvard.edu > Phone Number: 617-724-2358 > Fax: 617-726-7422 > > Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting > FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 > www.nmr.mgh.harvard.edu/facility/filedrop/index.html > Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > The information in this e-mail is intended only for the person to whom it is > addressed. If you believe this e-mail was sent to you in error and the e-mail > contains patient information, please contact the Partners Compliance HelpLine > at > http://www.partners.org/complianceline . If the e-mail was sent to you in > error > but does not contain patient information, please contact the sender and > properly > dispose of the e-mail. > _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
