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These analyses are also called second level analyses, and concentrate on the variation of activation between subjects in deciding the significance levels for SPMs. See Andrew Holmes' [http://www.fil.ion.ucl.ac.uk/spm/RFXposter.pdf poster on random effects] and [http://www.fil.ion.ucl.ac.uk/spm/RFXabstract.pdf abstract] (both in pdf format), and [http://www.fil.ion.ucl.ac.uk/spm/spm96.html some links to SPM mailing messages on random effects]. | These analyses are also called second level analyses, and concentrate on the variation of activation between subjects in deciding the significance levels for SPMs. |
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Darren Gitelman has also put together a very helpful [http://www.brain.nwu.edu/fmri/spm/ranfx.html summary and collation of SPM mailing list answers on random effects] with some links to papers on random effects. | For a comprehensive description of this problem in SPM, see the [http://www.fil.ion.ucl.ac.uk/spm/doc/books/hbf2/pdfs/Ch12.pdf random effects chapter] of the Human Brain Function book. See also the [http://www.fil.ion.ucl.ac.uk/spm/doc/biblio/Keyword/RFX.html RFX section] of the FIL/SPM bibliography. |
Principles of random effect analyses
These analyses are also called second level analyses, and concentrate on the variation of activation between subjects in deciding the significance levels for SPMs.
For a comprehensive description of this problem in SPM, see the [http://www.fil.ion.ucl.ac.uk/spm/doc/books/hbf2/pdfs/Ch12.pdf random effects chapter] of the Human Brain Function book.
See also the [http://www.fil.ion.ucl.ac.uk/spm/doc/biblio/Keyword/RFX.html RFX section] of the FIL/SPM bibliography.
There is a nice [http://psyphz.psych.wisc.edu/~oakes/spm/spm_random_effects.html random effects discussion on the Wisconsin site]
See also a useful set of [http://www.cu.mrc.ac.uk/~jaston/mrcjc/sld001.htm powerpoint slides on random effects], by John Aston, at the MRC Cyclotron Unit.