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All issues Volume 67 / No 3 (May 2010) Ann. For. Sci., 67 3 (2010) 302 Full HTML
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Table VI

Absolute mean bias (MAB), root mean square error (RMSE) and mean percentage of bias (MPB) of stem volume with and without crown variables for balsam fir, red spruce, and white pine.

Balsam fir Red spruce White pine
Model
MAB (m3) RMSE MPB (%) MAB (m3) RMSE MPB (%) MAB (m3) RMSE MPB (%)
Kozak (2004) Model 02 without crown 0.0090 0.0171 6.6734 0.0087 0.0159 5.9555 0.0574 0.0996 6.5803
Kozak (2004) Model 02 with CR 0.0085 0.0156 6.2899 0.0086 0.0161 5.8985 0.0587 0.1014 6.7258
Kozak (2004) Model 02 with CL 0.0085 0.0156 6.3153 0.0086 0.0161 5.9332 0.0582 0.1008 6.6668
Kozak (2004) Model 02 with HCB 0.0087 0.0165 6.4656 0.0086 0.0163 5.9139 0.0583 0.1014 6.6838
Clark et al. (1991) I without Crown 0.0082 0.0147 6.0595 0.0070 0.0128 4.7888 0.0540 0.1025 6.1865
Clark et al. (1991) I with CR 0.0070 0.0131 5.1463 0.0065 0.0109 4.4702 0.0469 0.0924 5.3738
Clark et al. (1991) I with CL 0.0070 0.0129 5.1798 0.0068 0.0115 4.6791 0.0541 0.1015 6.2023
Clark et al. (1991) I with HCB 0.0078 0.0143 5.7969 0.0079 0.0130 5.4126 0.0641 0.1125 7.3535
Clark et al. (1991) II without crown 0.0105 0.0200 7.7710 0.0110 0.0220 7.5495 0.0748 0.1516 8.5723
Clark et al. (1991) II with CR 0.0098 0.0188 7.2301 0.0108 0.0198 7.4272 0.0731 0.1477 8.3773
Clark et al. (1991) II with CL 0.0098 0.0187 7.2870 0.0109 0.0195 7.4755 0.0781 0.1576 8.9493
Clark et al. (1991) II with HCB 0.0106 0.0201 7.8187 0.0119 0.0215 8.2216 0.0856 0.1696 9.8180
Fang et al. (2000) without crown 0.0091 0.0169 6.7673 0.0088 0.0158 6.0287 0.0577 0.0964 6.6159
Fang et al. (2000) with CR 0.0086 0.0153 6.3329 0.0086 0.0154 5.8940 0.0576 0.0963 6.6065
Fang et al. (2000) with CL 0.0084 0.0151 6.1996 0.0085 0.0154 5.8388 0.0577 0.0963 6.6145
Fang et al. (2000) with HCB 0.0086 0.0153 6.3526 0.0086 0.0155 5.9427 0.0576 0.0963 6.6057

CR: Crown ratio. CL: Crown length. HCB: Height to live crown base.

Clark et al. (1991) I: upper stem diameters at 5.27 m were obtained by linear interpolation.

Clark et al. (1991) II: upper stem diameters at 5.27 m were predicted based on the regression form presented in Clark et al. (1991).