| g02hac | nag_robust_m_regsn_estim Robust regression, standard M-estimates |
| g02hbc | nag_robust_m_regsn_wts Robust regression, compute weights for use with g02hdc |
| g02hdc | nag_robust_m_regsn_user_fn Robust regression, compute regression with user-supplied functions and weights |
| g02hfc | nag_robust_m_regsn_param_var Robust regression, variance-covariance matrix following g02hdc |