PS, to clarify, I know F test is one directional and shows if a difference
exists between groups. I was just wondering if there might have been
something else going on due to the wording of the quote below, and because
the --fonly flag was used in the example. Maybe it only was reiterating
the sensitivity to change in either direction.
In this case wouldn't there be benefit in setting up the contrast
differently, so that a t-test could be performed at the same time?
Thanks!
Jake
Dear FSLers,
>
> Reading the website, I noticed it says
>
> "This F-test will be the main contrast of interest for our vertex analysis
> as it allows us to test for differences in either direction."
> http://www.fmrib.ox.ac.uk/fslcourse/lectures/practicals/seg_struc/index.html
>
> So I was wondering if someone could elaborate on how the F-test shows
> these differences in either direction. Is directionality maintained at
> this step because of the way the EV is set up, ctrl=-1 and patients=1? I
> wasn't able to figure it out yet by reading the archives and was confused
> by the nature of an F-test.
>
> Thanks in advance,
>
> Jake
>
>
>
>
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