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Table 2 Fit statistics for diameter prediction by the seven versions of M3 taper models fitted on the ‘fitting’ data set

From: Use of upper stem diameters in a polynomial taper equation for New Zealand radiata pine: an evaluation

h DUS

Fit statistic

MB

MAB (%)

RMSE

20 %

−0.331

3.758

5.404

30 %

−0.249

3.434

4.995

40 %

−0.077

3.243

4.731

50 %

0.208

3.108

4.543

50 % HABH

0.263

3.093

4.523

60 %

1.201

3.404

4.982

70 %

0.583

3.406

4.978

  1. h DUS stands for the measurement point for the upper stem diameter D us as a proportion of the total height of the tree. 50 % HABH stands for 50 % of the height above breast height. The lowest MAB and RMSE are given in italics. The percentages are based on a global mean outside bark diameter of 31.65 cm