I would appreciate a lot, if someone will clarify me the difference
between design matrix variables in SPM.mat. I am writing the
annotations as far as I understand them:
SPM.xX.X - regressors after convolution with HRF
SPM.xX.xKXs.X - regressors after convolution with HRF, high-pass
filter and non-sphericity correction
SPM.xX.nKX - ????
SPM.xX.K.X0 - ???
My final goal is to be able to run the linear regression in matlab and
to get the same betas as SPM does. Unfortunately, usage of none of the
listed matrices results in exact beta values.
Thanks a lot,