Comparison of model forms for estimating stem taper and volume in the primary conifer species of the North American Acadian Region | Annals of Forest Science

EDPS Account

Volume 67 / No 3 (May 2010)

Ann. For. Sci., 67 3 (2010) 302

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Table IV

Absolute mean bias (MAB), root mean square error (RMSE) and mean percentage of bias (MPB) of stem volume 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(%)
Max and Burkhart (1976)	0.0110	0.0243	8.1573	0.0115	0.0270	7.9398	0.0951	0.2091	10.9017
Kozak (2004) Model 01	0.0100	0.0189	7.3840	0.0098	0.0180	6.7521	0.0624	0.1037	7.1535
Kozak (2004) Model 02	0.0090	0.0171	6.6734	0.0087	0.0159	5.9555	0.0574	0.0996	6.5803
Bi (2000)	0.0090	0.0172	6.6428	0.0092	0.0174	6.3123	0.0557	0.0997	6.3860
Zakrzewski (1999)	0.0091	0.0173	6.7331	0.0100	0.0175	6.8875	0.0557	0.1003	6.3843
Valentine and Gregoire (2001)	0.0085	0.0162	6.3062	0.0092	0.0185	6.3125	0.0649	0.1254	7.4402
Sharma and Zhang (2004)	0.0104	0.0200	7.6699	0.0109	0.0231	7.5071	0.0723	0.1465	8.2871
Sharma and Parton (2009)	0.0108	0.0238	7.9902	0.0118	0.0285	8.1418	0.0875	0.1895	10.0282
Clark et al. (1991) I	0.0082	0.0147	6.0595	0.0070	0.0128	4.7888	0.0540	0.1025	6.1865
Clark et al. (1991) II	0.0105	0.0200	7.7710	0.0110	0.0220	7.5495	0.0748	0.1516	8.5723
Fang and Bailey (2000)	0.0091	0.0169	6.7673	0.0088	0.0158	6.0287	0.0577	0.0964	6.6159
Honer equation (1967)	0.0099	0.0176	7.3374	0.0110	0.0231	7.5901	0.0855	0.1671	9.8005
Geometric mean	0.0069	0.0137	5.1013	0.0079	0.0162	5.4171	0.0497	0.0848	5.6970

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).