Hi,
>right?
yes.
I see what you want. But I better leave that one for Christian.
Cheers,
Andreas
________________________________________
Von: FSL - FMRIB's Software Library [[log in to unmask]] im Auftrag von Diederick Stoffers [[log in to unmask]]
Gesendet: Freitag, 25. März 2011 15:18
An: [log in to unmask]
Betreff: Re: [FSL] AW: [FSL] AW: [FSL] dual regression summary statistic
Hi Andreas,
Thats makes sense. However, as the Smode describes the scaling of the timecourse of the complete ICA spatial map in a subject, differences that show up between groups in dual regression do not necessarily mean that the Smodes differ between groups, right?
For example, I have two group groups that show different connectivity (dual regression tfce_corrp_tstat map shows extensive between group differences in all parts of the DMN) but no differences in mean absolute values of Smode. I guess this is probably not the summary statistic I am after, do you (or anyone else) have other suggestions?
Cheers
Diederick
On 24 mrt 2011, at 23:46, Andreas Bartsch wrote:
Hi Diederick,
the Smode is a measure of response strength or magnitude. Effectively, you can think of it to scale the time course. For a Smode of zero the IC is essentially absent for a given subject in the set. The more robust and consistent a component is for a set of sessions / subjects, the more clearly it deviates from zero and the smaller its variance will display (see the boxplots). Therefore, it is always a good idea to look at these boxplots (and the values). You can flip the sign by either flipping the Tmode or Bmode.
Does that makes sense?
Cheers,
Andreas
________________________________
Von: FSL - FMRIB's Software Library [[log in to unmask]] im Auftrag von Diederick Stoffers [[log in to unmask]]
Gesendet: Donnerstag, 24. März 2011 10:23
An: [log in to unmask]<mailto:[log in to unmask]>
Betreff: Re: [FSL] AW: [FSL] dual regression summary statistic
Hi Andreas,
From what I can find on the mailinglist the numbers in Smode indicate the relative contribution of a subject to a specific ICA component (when you did ICA on concatenated data), am I right? Could you verbally describe the meaning of this number in more exact terms?
Thanks!
Diederick
On 23 mrt 2011, at 16:50, Andreas Bartsch wrote:
Hi,
the Smode is a good start to look at.
Cheers-
Andreas
________________________________________
Von: FSL - FMRIB's Software Library [[log in to unmask]] im Auftrag von Diederick Stoffers [[log in to unmask]]
Gesendet: Mittwoch, 23. März 2011 15:17
An: [log in to unmask]<mailto:[log in to unmask]>
Betreff: [FSL] dual regression summary statistic
Hi all,
I ran a dual regression analysis on two groups and found some quite interesting results. Besides presenting stat maps for each network, I would also like to have a scatter plot showing network strength against a behavioural measure, I looked into the stage 2 maps but am not sure yet how best to proceed. Any thoughts on a good measure to use for this?
Many thanks,
Diederick
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