There is no way to model a missing cell in the FSGD. You'd have to figure out a value (eg, using imputation) or exclude those subjects

On 11/30/2021 2:59 PM, Laura Willers de Souza wrote:

External Email - Use Caution

Hello FreeSurfer Developers,

I would like to know what I put in the FSGD file for patients who don't have data for a variable.

In my case, I want to analyze CU (cognitively unimpaired) patients versus CI (cognitively impaired) patients, controlling for CSF and plasma cortisol values. And some patients have only the CSF value and others only the plasma value.

Would the analysis be correct if I put the mean of the non-missing values of this variable in those cells that don't have data?

Would you be so kind to help me with that?

Thanks in advance!

Laura.

---

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