Get the intercept, feedback matrix and the variance-covariance matrix from GVAR without global factors
Get_G0G1Sigma(ParaVARX, GVARinputs, Ai0, Ai1, Wi)
Set of VARX model parameters
List of inputs for GVAR-based models
list containing the country-specific intercepts
list containing the country-specific feedback matrices
list containing the country-specific link matrices