| npbr-package | Nonparametric boundary regression |
| dea_est | DEA, FDH and linearized FDH estimators. |
| green | American electric utility companies |
| loc_est | Local linear frontier estimator |
| loc_est_bw | Bootstrap bandwidth selection for the local linear frontier estimator |
| npbr | Nonparametric boundary regression |
| nuclear | Reliability programs of nuclear reactors |
| poly_est | Polynomial-based edge estimators |
| quad_spline_est | Constrained quadratic spline frontiers |
| quad_spline_est_kn | AIC (or BIC) criterion for choosing the number of knots for quadratic splines |