nag_robust_m_regsn_user_fn (g02hdc) Example Program Results (User-supplied callback chi, first invocation.) (User-supplied callback psi, first invocation.) nag_robust_m_regsn_user_fn (g02hdc) required 5 iterations to converge k = 3 Sigma = 2.7783 Theta 12.2321 1.0500 1.2464 Weights Residuals 0.4039 0.5643 0.5012 -1.1286 0.4039 0.5643 0.5012 -1.1286 0.3862 1.1286