Table 3. Diameter-at-breast-height (dbh) threshold values (xt) for the occurrence of nonexcavated cavities in different tree species. β1 and β0 correspond to the parameter estimate and intercept of the logistic regression between dbh and occurrence of cavity. AUC is the area under the receiver-operating characteristic (ROC) curve, and c is the cut-off value obtained from the ROC curves (see Methods).
| |
| |
| Tree species |
β1 |
β0 |
AUC |
c |
xt(cm) |
| |
Balsam fir
(Abies balsamea) |
0.107 |
-7.34 |
0.63 |
0.0122 |
27.6 |
White birch
(Betula papyrifera) |
0.111 |
-8.36 |
0.69 |
0.0069 |
30.5 |
Spruce sp.
(Picea sp.) |
0.077 |
-7.96 |
0.71 |
0.0032 |
28.8 |
|
| |
|