Subject: | | 2x2x3 ANOVA - full or flexible factorial? contrasts? |
From: | | Maria Schmidt <[log in to unmask]> |
Reply-To: | | [log in to unmask][log in to unmask]> wrote: > Dear Vladimir, > > I am working on a way to import eegdata out of Eeglab into SPM in order to > be able to do a 3D source reconstruction. For the moment, I export the > eegdata out of eeglab to .bdf format, convert via spm this format to a spm > friendly format and perform a 3D source reconstruction. Everything works > well when these manipulations are done by hand, but several attempts to > execute these commands by the batch interface failed in several steps : > > - The eegdata can already be epoched in eeglab. In the conversion module > however, I cannot select 'epoched' and 'trials defined in data' as reading > mode. The only working option is 'continuous'. Although the trials are > correctly recognized in SPM by view => MEEGdata (trials). By hand (without > batch) I used the same data, chose the option 'just read' and could define > the trials without problems in the Epoching section. When running the > 'epoching' module, with one trial defined I get the error : "index exceeds > matrix dimension". Should I define each trial separately for each patient ? > Isn't it possible to use the trial information to do the epoching? > > - The reason for working with BDF files was that it allowed us to import the > channel locations in spm without further input. During 3D source > reconstruction it suffices to press the 'template', the 'coregistration' and > the 'Forward' button (EEG BEM) without further input to set up the 3D head > model and start with the actual inversion. Using the batch interface I seem > to be obliged to input the coordinates of the fiducials manually. (Maybe > only one time, which can then be copied - as the rest of the file - once it > is in .m format). I tried to put the names of the electrodes as 'labels' and > the 'select from a list' option for three electrodes, but that did not work > out. Please be aware of the fact that I do not have measures of the > subject's heads, so I am forced to use the standard coordinates. > > Is there a kind of manual especially for the batch interface? > > Yours sincerely, > > Jeroen. > >[log in to unmask] |
Date: | | Wed, 2 Nov 2011 17:14:28 +0100 |
Content-Type: | | text/plain |
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Dear SPMers,
I want to calculate a 2x2x3 ANOVA in SPM 8 and am in desperate need of your help.
I have factors 1 (anxiety: yes/no) and 2 (depression: yes/no) with two levels each, and factor 3 (difficulty: low/middle/high) with three levels.
I'm interested in main effects of all three factors as well as in all possible interactions and the three-way interaction (anxiety x depression x difficulty).
As far as I've understood by now (by reading tutorials and the manual), I need to do this with a full factorial model since in flexible factorial, you need a subject factor and you can't do three-way interactions, right?
Then, in the full factorial SPM 8 batch, I enter the three factors (with name, levels and independence) and then I need to specify cells. This is the point where I get lost: what is meant by "cell" and by "levels"? What do I enter there? Which of my total scans do I need to enter where?
And is there a nice tutorial on contrast vectors for full factorial models? I've already read the one by Gläscher & Gitelman which helped a lot for flexible factorial models, but not as much for full factorial models (I think)?
I would be really happy about all kinds of answers!
Best regards,
Maria
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