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 random effects chapter of the Human Brain Function book - second edition.

See also the RFX section of the FIL/SPM bibliography.

There is a random effects discussion on the Wisconsin site

Get a fuller picture in this tutorial or this one.