Hi,
The metric values have no association with the IQR (they are not normalised or anything like that). You can either determine your own threshold to use, or go with the default (based on the boxplot definition of an outlier). As to your second questions, there's no reference value. If you want to use some other threshold, based on the metric values themselves, then you can either take the metric output and create your own threshold and set of regressors, or re-run fsl_motion_outliers with the threshold you've calculated from the first run and then it will create the regressors for you (with the slight inefficiency of re-running).
All the best,
Mark
On 9 Sep 2013, at 22:11, [log in to unmask] <[log in to unmask]> wrote:
> Hello FSL experts,
>
> I have a few questions relating to the FSL_motion_outliers tool.
>
> Based on the metric values generated with the -s option, are these values
> relative to the run specific interquartile range (IQR), and/or is there an
> iterative function that can account for the disturbances in the data set
> as a whole caused by potential motion outliers? Any clarification on this
> process would be greatly appreciated.
>
> Secondly, if a reference value (of some sort) is generated per. run, is
> there a way to extract that given value?
>
> Thank you for your insight on this!
>
> Jacob
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