We get these kind of reports occasionally. When I ask people to confirm
that they use exactly the same design matrix in SPSS, I never hear back,
so I assume that it gets resolved. So please check. The other thing you
can do is to run in matlab, something like
cd glmdir/contrast
X = load('Xg.dat');
y = load('ocn.dat');
C = load('C.dat');
[beta rvar] = fast_glmfit(y,X);
[F p] = fast_fratio(beta,X,rvar,C);
p will be the p-value
If you used an unsigned cluster-forming threshold (ie, abs), then it is
possible that some of the voxels are pos and some are neg so that they
average out
doug
On 01/26/2015 09:03 AM, maaike rive wrote:
> Dear Freesurfer experts,
>
> Sorry to bother you again, but I have two more questions about
> extracting (thickness/surface/GI) values from a certain cluster.
>
> As I understood, the abs.y.ocn.dat file gives the average values for a
> given significant cluster (e.g. a cluster where there is a significant
> AxB interaction).
>
> I may be completely misunderstanding things, but if I use these values
> in SPSS for further statistics and test the same interaction (AxB),
> than according to SPSS this interaction is /not /significant
> (corrected for the same covariates as in the FSGD file).
>
> Could you tell me what is going wrong here? I do not trust my results now.
>
> Furthermore, is it possible (and if so, how?) to extract the average
> values of exactly the same cluster, but in an independent group not
> used in the analysis, for post-hoc comparisons in SPSS?
>
> Thanks,
>
> Maaike
>
>
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--
Douglas N. Greve, Ph.D.
MGH-NMR Center
gr...@nmr.mgh.harvard.edu
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Fax: 617-726-7422
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