mixed effects model and ICC
Hello,
I ran a mixed effects model to test the inter-individual and intra-individual stability of peaks across time in EEG data. Fixed effects: sessions (3 of them) and hemisphere (right/left) - both within-subjects factors. Random intercept=participants. Then, I calculate ICC by taking the random intercept variance=.219 and residual variance=.994 and calculating .219/(.219+.994) = .18. I interpreted this as 18% of the variance reflects stable inter-individual variability (as seen by my plots showing average peaks staying relatively the same across sessions) and 82% reflects within-subject instability (as seen by individuals changing peaks across sessions).
- Is this the best way to answer my questions of inter- and intra-individual stability?
- Did I calculate ICC correctly with the JASP output from the mixed effects model?
Thank you.