Hi list, by applying the model reported above I obtained opposite maps for slope and intercept. E.g. In HC-MCI folder, the sig.nii.gz for slope and intercept show the same maps which inverse color (pos/neg). I guess that there is an error in my model for 3GV1. Please could you check in. Thanks Stefano
----Messaggio originale---- Da: "Douglas N Greve" greve@nmr.mgh.harvard.edu Data: 14-lug-2017 0.45 A: freesurfer@nmr.mgh.harvard.edu Ogg: Re: [Freesurfer] R: Re: 3G1V.fsgd
those are correct
On 07/13/2017 05:44 PM, stdp82@virgilio.it wrote:
Many thanks!
In conclusion, you can confirm that the complete list of contrast reported below is corrected for 3g1v, please?
Contrast 1) HC-MCI_intercept.mtx 1 -1 0 0 0 0
Contrast 2) HC-MCI_slope.mtx 0 0 0 1 -1 0
Contrast 3) HC-AD_intercept.mtx 1 0 -1 0 0 0
Contrast 4) HC-AD_slope.mtx 0 0 0 1 0 -1
Contrast 5) MCI-AD_intercept.mtx 0 1 -1 0 0 0
Contrast 6) MCI-AD_slope.mtx 0 0 0 0 1 -1
Contrast 7) effect.intercept.mtx 1 -1 0 0 0 0 1 0 -1 0 0 0
Contrast 8) effect.slope.mtx 0 0 0 1 -1 0 0 0 0 1 0 -1
Contrast 9) HC+MCI-vs-AD.intercept.mtx 0.5 0.5 -1 0 0 0
Contrast 10) HC+MCI-vs-AD.slope.mtx 0 0 0 0.5 0.5 -1
Kind regards,
Stefano
----Messaggio originale---- Da: "Douglas N Greve" greve@nmr.mgh.harvard.edu Data: 13-lug-2017 22.30 A: freesurfer@nmr.mgh.harvard.edu Ogg: Re: [Freesurfer] 3G1V.fsgd
On 07/13/2017 10:37 AM, stdp82@virgilio.it wrote:
Dear FS group,
I don't understand how I should build the contrast for 3 groups 1 covariate. No specific example is provided within fsgd example and also other colleagues report the same problem in the mail list. Please could you provide us details on this topic? Especially, how should be the g3v1.intercept and g31v.slope?
1 -1 0 0 0 0 1 0 -1 0 0 0 for g3v1.intercept.mtx
This is the main effect of group on the intercept regressing out the effect of covariate.
and 0 0 0 1 -1 0 0 0 0 1 0 -1 for g3v1.slope.mtx
This is the main effect of group on the slope regressing out the effect of group intercept.
are corrected?
Waiting for you very wellcome suggestions
Thanks and kind regards
Stefano
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