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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

From: Estimating upper stem diameters and volume of Douglas-fir and Western hemlock trees in the Pacific northwest

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