Its one value per voxel per subject. So there is variane across subjects. and I want to see weather that value is different from 0.5 instead of 0.
Maryam On Mon, Oct 1, 2012 at 8:54 PM, Douglas Greve <gr...@nmr.mgh.harvard.edu>wrote: > > So it is only one volume? This won't work with mri_glmfit. glmfit needs to > have a value for each subject so that it can compute the variance across > subjects (needed to infer whether a difference from 0 is significant). I > don't know of any software that will do it. > > doug > > > > On 10/1/12 6:59 PM, Maryam Vaziri Pashkam wrote: > > Hi Doug, > > The output of the analysis is a volume with performance values in each > voxel. the performance ranges between 0 to 1 and I want to see if across > subjects there is any region with above chance performance (Chance is 0.5). > > Maryam > > On Mon, Oct 1, 2012 at 6:10 PM, Douglas N Greve <gr...@nmr.mgh.harvard.edu > > wrote: > >> Hi Maryam, I must confess ignorance on search-light analysis. Can you >> give me more background on what it is, the output data, and what you want >> mri_glmfit to tell you? >> doug >> >> >> On 09/30/2012 09:46 PM, Maryam Vaziri Pashkam wrote: >> >>> Hi Dough, >>> >>> I have run a searchlight analysis on 10 subjects and want to run a >>> random effects analysis with mri_glmfit across subject. I have the results >>> of each subject projected on the fsaverage surface. But I have no idea how >>> to make it to >>> 1) compare the values in each voxel with 0.5 instead of 0 >>> 2) how to make it ignore the fact that I dont have variance for each >>> subject and only have a single performance value (support vector machine >>> performance) for each voxel (it looks like the mri_glmfit needs a >>> ces.var.nii) >>> >>> Any idea how I can do this? Sorry if this is a rookie question. I am >>> totally new to searchlight and random effects analysis in fsfast. >>> >>> Thanks, >>> Maryam >>> >>> >> -- >> 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: www.nmr.mgh.harvard.edu/facility/filedrop/index.html >> >> >> >> 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. >> >> > >
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