Table 3.

Statistical analysis of leaf area index estimated by the LAI_M method using a constant k value (LAI_M1), a k derived from f_f (LAI_M2) and using the instantaneous fraction of incident radiation absorbed by the canopy as a proxy value for k (LAI_M3).

Approach	RMSE	MAE	MBE	r2	d
LAIM1	0.61 (25%)	0.46 (19%)	0.07 (3%)	0.30	0.70
LAIM2	0.44 (18%)	0.36 (15%)	−0.06 (−2.4%)	0.40	0.71
LAIM3	0.22 (9%)	0.17(7%)	0.01 (0.2%)	0.85	0.96

RMSE is the root mean square error (mm·day⁻¹); MBE is the mean bias error (mm·day⁻¹); MAE is the mean absolute error (mm·day⁻¹); r² is the coefficient of determination (dimensionless); d is the index of agreement (dimensionless).