I can think of the following: use the two values of visit2 - visit1 and visit3 - visit2 from each subject as input with the two time intervals as covariate in 3dLME. Follow example 2 in the 3dLME HELP. Not sure if that would address your question.
Alternatively ignore the time intervals, and obtain the intraclass correlation (ICC) value as a measurement of reliability using 3dICC_REML:
[
afni.nimh.nih.gov]
Gang
Edited 1 time(s). Last edit at 05/25/2014 05:10PM by Gang.
