Dear SPM'ers
I have an event-related analysis with the canonical hrf and its two
derivatives. Most of the variance is explained by the time derivative of
the hrf, so I would like to make a contrast in which the time derivative
has a higher weight than the hrf and the dispersion derivative.
My question is: is an spm{T} valid if the contrast weights of the basis
functions are not equal? My feeling is that only an spm{F} is valid when
a reduced model is used.
Regards
Alle Meije
--
Alle Meije Wink
Institute for Mathematics and Computing Science
University of Groningen
P.O. Box 800 9700 AV Groningen
Telephone: +31 50 363 71 27 Fax: +31 50 363 38 00
E-mail: [log in to unmask] WWW: http://www.cs.rug.nl/~wink
Please avoid sending me Word or PowerPoint attachments
(see http://www.fsf.org/philosophy/no-word-attachments.html)
|