Hello Afni Experts.
I am trying to run group analysis on 54 subjects whose level-1 deconvolution was performed with tent basis functions. I have IRESP files for two conditions (short and long delay trials, modeled separately as the trial lengths are considerably different). I am interested in an interaction between time (TR) and between subjects covariate (age). I would like to specify an autocorrelation structure of the residuals. I have been successful in implementing this in 3dLME with one condition only but the program hangs/does not run (gives the "if the program hangs here for more than thirty minutes" message) when I try to include both conditions (adding a fixed effect of condition).
Is it possible to specify an autocorrelation structure via the "-corStr AR1" flag in 3dLME with two fixed effects? (i.e. age, condition).
In a related question, how does 3dMVM handle autoregressive residuals via group analysis with multiple basis functions?I know it mentions simulation data were autocorrelated In Gang's recent paper in Frontiers . However, I am still trying to make sense of the details.
Thanks!
Best,
Brenden