I would look for differences among 4 different groups (A, B, C, D). e.g. I expected that the impaiment is A<B<C<D. Thus, I should opt for G1+G3 vs G2+G4 or G1+G2 vs G3+G4? Other option? Sorry, I'm confused on this matter and worried to produce correct results. Thank you very much. Best regards Stefano
----Messaggio originale---- Da: "Douglas N Greve" greve@nmr.mgh.harvard.edu Data: 20-apr-2017 17.07 A: freesurfer@nmr.mgh.harvard.edu Ogg: Re: [Freesurfer] R: Re: R: Re: FSGD file FS-FAST
On 04/19/2017 04:37 PM, stdp82@virgilio.it wrote:
I'm sorry but it not clear to me. There are 2 factors, 2 levels, while I
have 1
Factor, 4 Levels
It is still four groups.
In particular, have I looked to difference between Group1+Group2 vs Group3+Group4? Is it correct 0.5 -0.5 0.5 -0.5?
That will give you G1+G3 vs G2+G4
Thanks
Stefano
----Messaggio originale---- Da: "Douglas N Greve" greve@nmr.mgh.harvard.edu Data: 19-apr-2017 19.23 A: freesurfer@nmr.mgh.harvard.edu Ogg: Re: [Freesurfer] R: Re: FSGD file FS-FAST
There is one for 4 Groups with 1 covariate. Use that one and do not include the covariate.
On 04/19/2017 02:37 AM, stdp82@virgilio.it wrote:
I did not find it for for 4 Groups (1 Factor, 4 Levels), Zero Covariates.
I need for check to avoid error on my analysis. Please could you say me whether the followed codes are correct.
A) Group effect 1 -1 0 0 1 0 -1 0 1 0 0 -1
This will generate an F test for the group effect
B) 0.5 0.5 -0.5 -0.5
This looks like it will test a difference between Group1-and-2 vs Group3-and-4
Many thanks.
Stefano
----Messaggio originale---- Da: "Douglas Greve" <greve@nmr.mgh.harvard.edu> Data: 19-apr-2017 3.50 A: <freesurfer@nmr.mgh.harvard.edu> Ogg: Re: [Freesurfer] FSGD file FS-FAST Have you looked at https://surfer.nmr.mgh.harvard.edu/fswiki/FsgdExamples ? On 4/17/17 5:32 PM, stdp82@virgilio.it wrote:Hi list, please could you suggest me the group.effect.mtx and the file.mtx relative to Null Hypothesis for 4 Groups (1 Factor, 4 Levels), Zero Covariates. DODS or DOSS. Thanks Stefano _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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