Skip to main content

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