You need to use the -s option if you want to get the metric values (in this case the metric is FD). The output from -o is the locations of the identified outliers (it will not be created if there are no outliers). Note that you currently must specify the -o option even if you don't want this output.
All the best,
On 4 Apr 2013, at 12:37, zhang mingxia <[log in to unmask]>
> Dear FSL experts,
> For reviewers' suggestion, I am trying to get framewise displacement for my analysis. I found the script of fsl_motion_outliers could do that. Following the instruction (if I understand correctly), I used the script as below:
> fsl_motion_outliers -i raw.nii.gz --fd -o try.txt
> I expected there was a column in try.txt which should be the framewise displacement. But there was a column of zero. What's wrong with my use of this script?
> Mingxia Zhang