Table 8 Parameter estimates for individual tree survival (Eq. [5]), the area under the curve (AUC) and optimal cutpoint (OCP) for the developed equation and the ones used in the Northeast Variant of FVS (FVS–NE) by species
SPPa | N | FVS–NE | Equation [5] | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Alive | Dead | AUC | AUC | OCP | b 50 | b 51 | b 52 | b 53 | b 54 | b 55 | b 56 | |
AB | 2991 | 596 | 0.6885 | 0.7740 | 0.8028 | 7.4069 | –0.0855 | – | 2.9649 | –0.1041 | – | – |
AS | 541 | 59 | 0.5439 | 0.6962 | 0.8900 | –2.6972 | –0.0511 | 2.7220 | 3.1868 | – | –0.2677 | – |
BF | 364 | 145 | 0.6190 | 0.6936 | 0.7480 | 5.4321 | –0.0618 | – | – | –0.0383 | – | – |
EH | 2752 | 88 | 0.5098 | 0.6301 | 0.9584 | –1.9897 | –0.0809 | 3.1020 | – | – | – | – |
OH | 2159 | 315 | 0.6872 | 0.7313 | 0.8760 | –0.7529 | –0.0709 | 2.5867 | – | - | – | –0.1076 |
OS | 470 | 79 | 0.5585 | 0.6767 | 0.8718 | 15.1544 | –0.2712 | 2.4283 | – | –0.2753 | – | – |
QA | 465 | 109 | 0.6645 | 0.7304 | 0.8296 | 0.2811 | –0.0517 | 1.7626 | – | – | –0.2104 | – |
RM | 2587 | 284 | 0.4793 | 0.6926 | 0.8906 | 11.2896 | –0.1113 | – | – | –0.1480 | – | – |
RN | 845 | 58 | 0.4866 | 0.9483 | 0.9365 | 8.9149 | 0.2446 | – | – | – | – | –0.5346 |
RO | 530 | 12 | 0.5741 | 0.7962 | 0.9757 | –6.2021 | –0.0889 | 4.5545 | – | – | – | – |
SM | 3842 | 359 | 0.4556 | 0.7453 | 0.9314 | 3.7231 | –0.1037 | 1.9431 | – | –0.1096 | – | – |
SP | 1613 | 240 | 0.5690 | 0.7034 | 0.8911 | 7.1204 | –0.0591 | – | – | –0.0794 | – | – |
WC | 324 | 11 | 0.4753 | 0.8157 | 0.9541 | 10.5219 | 0.1672 | – | – | – | –1.6906 | – |
WP | 3782 | 222 | 0.7106 | 0.7980 | 0.9212 | 4.3116 | –0.0242 | 2.0274 | – | – | – | –0.2974 |
YB | 2601 | 348 | 0.5150 | 0.7298 | 0.9081 | 8.9994 | –0.0607 | – | – | –0.1359 | – | – |