Correction: Fitting and Calibrating a Multilevel Mixed-Effects Stem Taper Model for Maritime Pine in NW Spain.

In Table 4, the value for δ in the “MM3 (a1, b3)” column is incorrect. Please see the corrected Table 4 here.

Table 4

Parameter estimates of the fixed-effects model (fitted by OLS, FMOLS) and the recommended mixed-effects model (expanding a1 and b3 with random effects, MM3), fitted using the whole data set.

Parameter	FMOLS	MM3 (a1, b3)
a0	0.9891	1.050
a1	0.9633	0.9427
a2	0.04585	0.04734
b1	0.3672	0.3619
b2	-0.3350	-0.6907
b3	0.5192	0.5847
b4	0.8471	1.126
b5	0.01777	0.02271
b6	-0.02647	-0.05812
σi,_a_12	σ2i,	1.263 10−5
σi,_b_32		8.273 10−4
σi,_a_1,_b_32		−1.104 10−5
σij,_a_12		1.205 10−4
σij,_b_32		3.095 10−3
σij,_a_1,_b_32		3.847 10−5
σ2	1.555	6.117 10−3
δ		1.481

, and , variances and covariance of random effects in parameters a1 and b3 at plot level; , and , variances and covariance of random effects in parameters a1 and b3 at tree level; σ2, residual variance; δ parameter of power function. Note that the σ2 of the mixed-effects model must be multiplied by g = d when applied (variance obtained from ordinary residuals is 0.6866).

The value for “delta” in the S1 Appendix is incorrect. Please view the correct S1 Appendix below.

R implementation of the calibration procedure for a multilevel mixed-effects model based on stem taper function of Kozak (2004).

(ZIP)

Click here for additional data file.