Hello AFNI experts, I'm trying to decide whether I need to run a sphericity correction (using the -SC flag) on my data in 3dMVM, but I would like to know whether it is necessary by first seeing what the p-values are for Mauchly's test. According to a recent publication by Chen, Adleman, Saad, Leibenluft, and Cox (2014), the Mauchly test for sphericity correction can be readily incorporated and established into multivariate modeling. My question is, how can I incorporate the Mauchly test in AFNI?
Full citation: Chen, G., Adleman, N. E., Saad, Z. S., Leibenluft, E., & Cox, R. W. (2014). Applications of multivariate modeling to neuroimaging group analysis: a comprehensive alternative to univariate general linear model. Neuroimage, 99, 571-588.