That should have failed because it only has 3 values (should have 4). I 
think it should be 0 0 0 1


On 4/11/19 3:20 AM, TMS lab wrote:
>
>         External Email - Use Caution
>
> You are right. I want simply to correlate myelin and nhpt regressing 
> out age.
> I did it with the following matrix:
> 0 0 1
> And it seems to work. Is it ok this matrix?
>
> Thanks a lot
> Rafael
>
> Il giorno gio 11 apr 2019 alle 00:22 Greve, Douglas N.,Ph.D. 
> <dgr...@mgh.harvard.edu <mailto:dgr...@mgh.harvard.edu>> ha scritto:
>
>     That will compute the average of the Age slope and the NHPT slope.
>     Probably not what you want to do
>
>     On 4/6/19 12:24 PM, TMS lab wrote:
>     >
>     >         External Email - Use Caution
>     >
>     > Dear Freesurfer team,
>     >
>     > I'm running a correlation analysis where I'd like to corelate
>     > myelination and a clinical parameter (NHPT) regressing out the
>     effect
>     > of age.
>     >
>     > My contrast.mtx: 0 0 0.5 0.5
>     >
>     > This is my FSGD FILE:
>     > GroupDescriptorFile 1
>     > Title Myelin
>     > Class Main
>     > Variables Age NHPT
>     > Inputfs_CGaMain  19   18.2
>     > .......
>     >
>     > Is the matrix ok?
>     >
>     > Thanks
>     > Rafael
>     >
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