nag_robust_m_regsn_estim (g02hac) Example Program Data 8 3 1. -1. -1. 2.1 1. -1. 1. 3.6 1. 1. -1. 4.5 1. 1. 1. 6.1 1. -2. 0. 1.3 1. 0. -2. 1.9 1. 2. 0. 6.7 1. 0. 2. 5.5 Nag_SchweppeReg Nag_HampelFun Nag_SigmaChi Nag_CovMatObs 3.0 1.5 3.0 4.5 1.5