Hello!

I have a somewhat complicated dataset: about 50 subjects, each containing at least 2 sessions but some have as many as 4 sessions. All sessions are at least 6 months apart (i.e., "longitudinal"). The problem is that the duration between sessions is not the same for all subjects. Some subjects have 6 months between sessions, others have years. Is there a way to look at change over time in FC in these subjects using some kind of linear mixed model or another method? Any help would be greatly appreciated!

Thank you!