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Hi Douglas,
Thanks for your reply. I am not sure how to do this with design matrix. I am trying to get higher order fit. Basically I want to see that whether the cortical thickness varies in a quadratic fashion with the behaviour score.
Are you are suggesting that I should put square root values of the behavioural scores in the design matrix? I am not sure if that is the right approach.
Looking forward to hearing back from you.
Abhinav
On Wed, 20 Feb 2019, 04:12 Greve, Douglas N.,Ph.D., DGREVE@mgh.harvard.edu wrote:
It sounds like you will just need to create your own design matrix and then feed it into mri_glmfit with --X (and not include --fsgd)
On 2/12/19 12:03 AM, Abhinav Yadav wrote:
External Email - Use CautionHello,
I am trying to do GLM analysis for cortical thickness with a behavioral score. I wanted to explore square fit in the GLM. Basically wanted to see weather the behaviour is related in a quadratic function instead of linear one.
Couldn't find any option for this is GLM fit.
I was thinking of feeding a squareroot values of the behavioural parameter in the GLM as an alternative. But not sure weather that will work. Please any one can help me with this.
Thanks, Abhinav
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