Hi,
On 8 Jul 2007, at 12:17, Suzanna Laycock wrote:
> Hi,
>
> I've been trying to analyse some DTI data over the last few months
> using TBSS and Randomise.
>
> I have a few quite basic questions, because a number of recent
> emails regarding stats - orthoganols, etc - have slightly confused me.
>
> I have a reasonably simple DTI experiment: a controls group of 9
> subjects, and a matched group of 9 experimental subjects. We are
> interested in finding any regions within the cerebrum or cerebellum
> which exhibit group differences in FA. To do this I used
> randomise, specifically the two-sample unpaired T-test.
>
> What we would like to do after that, is correlate the results at
> the potential anatomical sites with behavioural results we
> collected, for each individual. To do this we would need the FA
> values at each anatomical site. How does one get this?
To answer this and the next question: yes it is acceptable to
correlate the FA values resulting from the TBSS preprocessing with
the behavioural data to ask about this correlation, in a similar way
to the analysis you've already done.
Cheers.
>
> Is it acceptable to just correlate FA values with behavioural data,
> or would people recommend something else?
>
> Thanks for any advice
>
> Suzanna
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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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