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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