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= 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 [[http://www.fil.ion.ucl.ac.uk/spm/doc/books/hbf2/|Human Brain Function book]] - second edition.

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 [[http://psyphz.psych.wisc.edu/~oakes/spm/spm_random_effects.html|random effects discussion on the Wisconsin site]]

Get a fuller picture in [[http://www.bodowinter.com/tutorial/bw_LME_tutorial.pdf|this tutorial]] or [[http://www.sfs.uni-tuebingen.de/~hbaayen/publications/baayenDavidsonBates.pdf|this one]].