Random Effects Analysis within SPM
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This document describes how to use SPM to perform second level random
effects analyses for fMRI.  A summary of RFX issues can be found at

        http://www.brain.nwu.edu/fmri/spm/ranfx.html.




  Preparing for the analysis
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To perform a random effects analysis you need to have fit identical
(or near identical) models for each subject.  You will need a contrast
image from each subject that expresses the effect of interest.

It may be helpful to copy or link each of the relevant contrasts into
a single directory.



  Specifying and Estimating the Model
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Click the "Basic Models" button and select "One Sample t-test".

Select all the contrast images you want to analyze (one per subject!)

Select "<No Grand Mean scaling>", as the contrast images don't need
any scaling.

Answer "No", do not "explicitly mask images", as the contrast images
are already NaN-masked.

And finally, you can "omit" the global calculation since it's not
needed for grand mean scaling.


Click Estimate "Now", and you'll all done!  Just click "Results" to
the results.

 @(#)RFX.txt	1.1 01/08/30