Hello Freesurfers<br><br>I would like to run a specialized group GLM analysis on the volume 
using estimates from the individual subject analysis in Freesurfer as 
summary statistics.  I would like to learn a little more about how this 
estimation is done before doing so.  I have looked at the documentation 
for &quot;mri_glmfit&quot; and the following tutorial:<br>

<a href="http://surfer.nmr.mgh.harvard.edu/fswiki/FsFastTutorial" target="_blank">http://surfer.nmr.mgh.harvard.edu/fswiki/FsFastTutorial</a><br>I
 also have your 1999/2003 manuscripts on &quot;Signal Processing and 
Statistical Analysis for Event-Related fMRI&quot; and &quot;fMRI Analysis 101 - 
Univariate Analysis,&quot; but I am not sure if the method has been updated 
since then.<br>

<br>*
 I noticed there is a weight matrix (W) described for &quot;mri_glmfit&quot; 
command.  How is this derived and used?  I can&#39;t find more information 
about it in the documentation/mailing list.<br>
* How are the nuisance regressors organized in the B matrix?  I assume 
the conditions are first?  What are the following regressors?<br>* Do you have a similar manuscript that describes just how group analysis is implemented in FsFast?<br>
<br>Thank you for your time and help!<br><font color="#888888">Gabriel</font>