Gibbs_2PNO()
Gibbs Implementation of 2PNO
Gibbs_4PNO()
Gibbs Implementation of 4PNO
Total_Tabulate()
Calculate Tabulated Total Scores
Y_4pno_simulate()
Simulate from 4PNO Model
min2LL_4pno()
Compute 4PNO Deviance
rmvnorm()
Generate Random Multivariate Normal Distribution