I have not had time to do the math on this one. Rather than wait for me, you can just create your own design matrix with the regressors as reflected in your equation. Look at glmdir/Xg.dat for an example.

On 2/5/2021 3:14 AM, Marina Fernández wrote:

External Email - Use Caution

Dear experts,

In addition to t and p-value, I would like to report the beta coefficient of the fixed effects in the following regression equation for the vertex showing the max statistic within the cluster that survived multiple comparison correction:

y = β0 + β1*sex + β2*age + β3*(sex+age) + e

I know that beta.mgh contains the beta estimates corresponding to the intercepts of male and female and the slopes of age for each sex. However, what I need is the beta corresponding to the intercept (β0), and the beta for the slope of sex (β1), age (β2) and sex*age interaction (β3). I also

need the residual variance of the model (e), but rvar.mgh contains 4 values, 2 for the intercepts and another two for the slopes. I would really appreciate if you could help me to obtain this information.

Thanks a lot in advance

Marina

---

Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer