Hi - it depends on your second level design and, if it pooled
variance estimation over subjects, whether you are happy for that
pooling to have occurred between the different groups that you are
now separating - I'm afraid there's not enough information in your
email to tell.
Cheers, Steve.
On 28 Sep 2006, at 02:16, Soohyun Cho wrote:
> Hi,
>
> I am trying to re-run a third level analysis (pooling over
> subjects) with only a subset of subjects that was included in the
> original third level analysis.
> In this case, do I need to re-run the second level analysis using
> only the subset of subjects to get the proper cope images for the
> new third level analysis?
> Or can I just select the cope images from the previous 2nd level
> for the new third level of analysis?
>
> Thank you for your help,
> Soohyun.
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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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