Table 3.
Nonparametric multiplicative regression (NPMR) results for models predicting Columbia spotted frog occupancy in three states
| State | n Sites | logβ | Bootstrap results1 | N*2 | Predictor3 | Sensitivity | Tolerance |
|---|---|---|---|---|---|---|---|
| ID | 78 | 7.5 | 6.5 ± 0.22 | 15.9 | (+) MAXDEPTH | 0.07 | 1.5 (60%) |
| (±) HABITAT | na | na | |||||
| OR | 75 | 9.9 | 9.7 ± 0.19 | 15.7 | (±) HABITAT | na | na |
| (^) VEGHT | 0.1 | 24.7 (15%) | |||||
| (+) MAXDEPTH | 0.05 | 0.7 (35%) | |||||
| NV | 778 | 16.6 | 18.8 ± 0.38 | 71.8 | (+) MAXDEPTH | 0.14 | 0.5 (20%) |
| (s) EMERGVEG | 0.08 | 10 (20%) | |||||
| (±) FISHSTATUS | na | na | |||||
| (±) LOTICLENTIC | na | na |
1
Mean ± SE logβ from 100 bootstrap resampling runs.
2
N*, the average neighborhood size, is the average number of sample units contributing to the estimate of occupancy at each point on the modeled surface.
3
Symbols in parentheses indicate the general direction of the relationship between each predictor and response variable: “+” indicates positive, “^” indicates Gaussian, “s” indicates sigmoidal, and “±” indicates that the variable is categorical (and that sensitivity and tolerance values are not applicable).