Dear Sina,
"replication are over ..." refers to the random effect in your design, the
independent replications of your experiment, i.e. the subjects. However,
you might want to consider a within-subjects (=repeated measures) ANOVA to
account for the two runs that you acquired per subject. In this design the
replication are also over subjects/repl.
Cheers,
Jan
Sina Alexa Trautmann wrote:
> Dear SPMers!
>
> I got very confused reading the adds of the list about the
> non-sphericity correction in SPM2. I have the following problem:
> I want to do a one-way ANOVA in SPM2 with 20 subjects which each
> completed 2 runs meaning I have 2 conditions (1 condition per run). For
> each condition I have 1 contrast per subject (meaning 2x20 contrasts).
> If I want to do a non-sphericity correction, I would choose
> "replications are over: group(2)" because the conditions are measured in
> one session one after the other. Is that correct or do I have to choose
> "repl(20)"?
>
> I am looking forward to your advice and thank you in advance!
>
> Greets, Sina Trautmann
>
>
--
Jan Gläscher, Ph.D. Caltech Brain Imaging Center
+1 (626) 395-4976 (office) Caltech, Broad Center, M/C 114-96
+1 (626) 395-2000 (fax) 1200 California Blvd
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