Dear SPMers,
I have two questions about RFX analysis.
1) Is there a preferred method for doing the first level analysis:
should I calculate the con*.img files for the second level analysis on an
individual basis or should I use a multi-subject fixed-effects model, and
then calculate the single subject con*.img files by presenting the other
sessions (subjects) as null events (e.g. 2 conditions, subject 1: 1 -1 0 0 0
0.....; subject 2: 0 0 1 -1 0 0 ........ ; subject 3: 0 0 0 0 1 -1 0 0
......etc).
In the latter case, the individual con*.img files are not independent, I
would think.
2) Is it possible to do a RFX analysis with an unbalanced design, i.e. a
random-presentation event-related design with a different model for each
individual subject?
Sander
S.M. Daselaar
Department of Neurology
University Hospital "Vrije Universiteit"
Postal address: Visitors address:
c/o Secr. EMGO Dept. Meander L240
vd Boechorstraat 7 De Boelelaan 1117
1081 BT Amsterdam 1007 MB Amsterdam
The Netherlands
Tel: +31 (0)20 4444280
e-mail: [log in to unmask] <mailto:[log in to unmask]>
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