Hi Elizabeth,
In short, you should set the "group" column to contain all ones. The
group column defines "variance groups", which tells FEAT to try and
model separate variances for each group. This is generally only used
when you have a specific reason to do so, and when you have larger
sample sizes.
Anderson has written a good overview of what the group column is used for:
https://brainder.org/2017/02/24/group-indicator-fsl/
Cheers,
Paul
On 11/10/2018, Elizabeth Burnette <[log in to unmask]> wrote:
> After setting up a between-groups FEAT with two covariates of non-interest
> like this,
> [image: Screen Shot 2018-10-11 at 10.30.20 AM.png]
> I am getting this error message.
> [image: Screen Shot 2018-10-11 at 10.30.01 AM.png]
> It looks to me similar to the example given on the FSL wiki for "two group
> difference adjusted for covariate"
> <https://fsl.fmrib.ox.ac.uk/fsl/fslwiki/GLM#Two-Group_Difference_Adjusted_for_Covariate>
> --
> the sample also has more than one non-zero value in an EV, so I'm not sure
> what my issue is.
>
> I am very new to FSL, so please feel free to over-explain in any replies!
>
> --
> Elizabeth Burnette
> PhD Student, Neuroscience
> UCLA
>
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