Re: [Freesurfer] Questions about GLM

2021-12-13 Thread Laura Willers de Souza
External Email - Use Caution Dear Douglas, Thank you for the answer! Best regards, Laura Willers de Souza Master Student in Biochemistry Zimmer Lab - Federal University of Rio Grande do Sul - Porto Alegre/RS - Brazil ___ Freesurf

Re: [Freesurfer] Questions about GLM

2021-12-10 Thread Douglas N. Greve
If you run it with --eres-save, it will save the residuals in eres.mgh On 12/4/2021 11:17 AM, Laura Willers de Souza wrote: External Email - Use Caution Hello FreeSurfer Developers, I would like to assess whether my regression model meets the GLM assumptions, especially if there is n

[Freesurfer] Questions about GLM

2021-12-04 Thread Laura Willers de Souza
External Email - Use Caution Hello FreeSurfer Developers, I would like to assess whether my regression model meets the GLM assumptions, especially if there is no multicollinearity. Is it possible to perform this diagnosis in freesurfer? If not, is there a way to extract the mod

Re: [Freesurfer] Questions about GLM, Random and Fixed Effects Analysis in FsFast

2011-03-14 Thread Douglas N Greve
Hi Gabriel, for mri_glmfit, W = diag(sqrt(1./yffxvar)), ie, it is a diagonal matrix where each element is the square root of the inverse of the variance from the lower level. This changes the equation from a simple ordinary least squares into a weighted least squares (though not quite a true

[Freesurfer] Questions about GLM, Random and Fixed Effects Analysis in FsFast

2011-03-13 Thread Gabriel A. Tobon
Hello Freesurfers I would like to run a specialized group GLM analysis on the volume using estimates from the individual subject analysis in Freesurfer as summary statistics. I would like to learn a little more about how this estimation is done before doing so. I have looked at the documentation