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FSL  July 2008

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Subject:

Re: ANOVA repeated measures 2x2

From:

"Christian F. Beckmann" <[log in to unmask]>

Reply-To:

FSL - FMRIB's Software Library <[log in to unmask]>

Date:

Tue, 8 Jul 2008 10:38:58 +0100

Content-Type:

multipart/mixed

Parts/Attachments:

Parts/Attachments

text/plain (16 lines) , eg8_anova_small.png (16 lines) , text/plain (76 lines)

Hi

EVs 1-3 need to be mean 0, i.e. the values in there should be -10/19  
and +9/19 respectively. However, it seem that in your design each  
subject was scanned repeatedly? If so, the design would have to be  
different altogether, the 2x2 example in the feat manual describes a  
scenario where in each factor&levels group (cell of the ANOVA table)  
there exist 2 measurements from separate subjects and each subject  
only ever appears once in the ANOVA table. How many measurements exist  
in your ANOVA table per cell?
cheers
Christian





On 5 Jul 2008, at 23:38, Anne Schneider wrote: > Hello, > > I am a student at the University of York and would be very grateful > if you > could perhaps give me some advice with regards to the following fsl- > related issue. > > I am planning to run higher-level analysis for 19 subjects using an > ANOVA > 2x2 repeated measures - I have 2 factors, each at two levels: Valence > (positive and negative) & Arousal (high and low). (I.e. each subject > listened to the same stimuli, which were grouped according to these > categories)I've had a look at the feat manual but can't quite > understand > the illustrated example. Would my design matrix look this: > > Group EV1 EV2 EV3 EV4 > Input1 1 -1 -1 1 1 > Input2 1 -1 -1 1 1 > Input3 1 -1 1 -1 1 > Input4 1 -1 1 -1 1 > Input5 1 -1 -1 1 1 > Input6 1 -1 -1 1 1 > Input7 1 -1 1 -1 1 > Input8 1 -1 1 -1 1 > Input9 1 -1 -1 1 1 > Input10 1 -1 -1 1 1 > Input11 1 1 1 1 1 > Input12 1 1 1 1 1 > Input13 1 1 -1 -1 1 > Input14 1 1 -1 -1 1 > Input15 1 1 1 1 1 > Input16 1 1 1 1 1 > Input17 1 1 -1 -1 1 > Input18 1 1 -1 -1 1 > Input19 1 1 1 1 1 > > The way I understand it - EV1 models the effect of A, EV2 of B, EV3 > the > interaction between both & EV4 the grand mean (?) > > With three F-tests being performed: > > A 1 0 0 > B 0 1 0 > AB 0 0 1 > > I am new to fsl (& neuroimaging in general) so please forgive the > naivety > of the following question as well - would I have to use the 4 lower- > level > copes for (i) positive-valence vs baseline (ii) negative-valence vs > baseline (iv) high-arousal vs baseline (v) low-arousal vs baseline? > OR 2 > lower-level copes for (i) negative > positive valence (ii) high > arousal > > low arousal?? > > I would be extremely grateful for any sort of advice or help you could > provide on this issue. > > Best wishes, > Anne

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