There is not a way to do this using an FSGD and a DODS model. It will
work if you change it to DOSS (if that is appropriate). Otherwise, you
will need to create your own design matrix and feed it to mri_glmfit
with --X
doug
On 9/13/13 10:21 PM, ye tian wrote:
Dear Freesurfers,
I am studying how the practice of meditation affects cortical
thickness. I have two types of meditations, and I also
know for how many years each mediator has meditated. Therefore,
ideally I would like my categorical factor to be meditation (control,
meditation1 and meditation2), and continuous factor to be the number
of years of meditation. This design, of course, has a problematic
column of zeros, which corresponds to the slope of the control (a
non-meditator has meditated for 0 years).
Does freesurfer has a way out of this problem? For example, I have
came across pseudoinverse methods in literature?
Any suggestion is highly appreciated.
Thank you very much!
Sincerely,
Ye
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