Hi, you can't combine multiple sessions within the very lowest level
analysis - but maybe you meant combine across sessions for all
subjects in one FE second-level analysis, with one EV per subject?
That would be ok I think.
Cheers.
On 31 Mar 2009, at 12:49, George He wrote:
> Thanks, Steve.
> sorry I didn't dig the FAQ before sending out the question.
> I did search the mailing list archive, though, and I found a thread
> where an approach of doing the cross-subject analysis with all first
> level (session) results was suggested in 2005 (with multiple EVs for
> multiple subjects). I guess this approach will give the same cross-
> subject result if only the copes are passed to the higher level
> analysis?
> Cheers,
> George
>
>
> On Tue, Mar 31, 2009 at 12:05 AM, Steve Smith <[log in to unmask]>
> wrote:
> Hi - you should be able to feed that single subject's first-level
> results into the 3rd-level analysis - see the FAQ entry on this.
> Cheers, Steve.
>
>
>
> On 30 Mar 2009, at 21:32, George He wrote:
>
> Hi,
> I have a study that each of the subjects had 2 sessions, except one
> subject who had only one session.
> When it comes to find the group mean, how do I set the model up?
> Normally if all subjects had at least 2 sessions, I can do a cross-
> session first (as 2nd level) and then do a 3rd level to get the
> group mean.
> But for the subject that had only one session, I cannot do a cross-
> session, then what do I feed to the 3rd level design?
> Thanks,
> George
>
>
>
>
> ---------------------------------------------------------------------------
> Stephen M. Smith, Professor of Biomedical Engineering
> Associate Director, Oxford University FMRIB Centre
>
> FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
> +44 (0) 1865 222726 (fax 222717)
> [log in to unmask] http://www.fmrib.ox.ac.uk/~steve
> ---------------------------------------------------------------------------
>
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Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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