> E=1/trace(XTC-1X)-1)
>
This is covered in a paper called "Optimal experimental design for
event-related
fMRI" by Anders Dale, from Human Brain Mapping 8, page 109.
Another good resource for a quick explanation of a few useful measures can be
found in a google search for "optseq2", which is a program that randomly
generates thousands of candidate sequences for an experimental design, and
displays those few that have performed best on the measures of
efficiency. This program was developed by Doug Greve, who is a
collaborator of Dale's.
Ken
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Ken Roberts
Woldorff Laboratory
Center for Cognitive Neuroscience, Duke University
(919) 668-1334
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