nag_correg_robustm_user_varmat (g02hfc) Example Program Results (User-supplied callback psp, first invocation.) (User-supplied callback psi, first invocation.) Covariance matrix 0.2070 0.0000 -0.0478 0.0000 0.2229 0.0000 -0.0478 0.0000 0.0796