Table 10 Bias and RMSE for estimating cubic volume including top and stump obtained from fitted taper equations (M4), volume equations fitted in this study (Local), and the volume equations used by FIA-PNW for dataset I, II, and III. Final models were fitted using all datasets and evaluation statistics were obtained by applying them to individual dataset
Species | Dataset | Method | Bias (m3) | RMSE (m3) |
|---|---|---|---|---|
Douglas-fir | I | M4 | −0.0277 | 0.2502 |
Local | 0.0003 | 0.2354 | ||
FIA-PNW | 0.0688 | 0.2830 | ||
II | M4 | −0.0042 | 0.0288 | |
Local | −0.0195 | 0.0347 | ||
FIA-PNW | −0.0098 | 0.0310 | ||
III | M4 | −0.1713 | 0.5258 | |
Local | −0.0563 | 0.3852 | ||
FIA-PNW | −0.0035 | 0.3564 | ||
Western hemlock | I | M4 | −0.0676 | 0.2850 |
Local | −0.0492 | 0.1773 | ||
FIA-PNW | −0.1504 | 0.3763 | ||
III | M4 | 0.1024 | 0.2706 | |
Local | 0.1411 | 0.3454 | ||
FIA-PNW | −0.0227 | 0.2217 |