Just remove that column. You don't need it or want it.
doug
On 9/15/13 11:42 PM, ye tian wrote:
Dear Doug,
I am afraid that I don't see a difference between fsgd file and
customized design matrix in this case. If I were to set up my own
design, the matrix would still have a column of zero's -- unless there
is a trick that I don't know?
Thank you very much for your patience.
Sincerely,
Ye
On Sun, Sep 15, 2013 at 2:28 PM, Douglas Greve
<gr...@nmr.mgh.harvard.edu <mailto:gr...@nmr.mgh.harvard.edu>> wrote:
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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