Calculate the mutual information using full Bayesian.
calc_MI_FB(x, items_list, ncat, model)
A numeric vector of MCMC sampled theta values.
A list of item parameter matrices.
A numeric vector of the number of response categories by item.
A numeric vector indicating the IRT models of each item (1: 1PL, 2: 2PL, 3: 3PL, 4: PC, 5: GPC, 6: GR).