| burgman1995 | Burgman, Grimson & Ferson (1995) combinatorial persistence test |
| ede_estimate | Extinction date estimate |
| mcinerny2006 | McInerny, Roberts, Davy & Cribb (2006) sighting-rate persistence test |
| ole | Optimal Linear Estimation of extinction date |
| robson1964 | Robson & Whitlock (1964) truncation point estimator |
| sighting_data | Construct a validated sighting record |
| solow1993 | Solow (1993) nonparametric persistence test |
| solow1993b | Solow (1993b) declining-population persistence test |
| solow2005 | Solow (2005) sighting-effort-weighted persistence test |
| strauss1989 | Strauss & Sadler (1989) confidence interval for the end of a range |
| strauss1989_curve | Full confidence curve for the Strauss & Sadler (1989) estimator |