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Table 5 With- and without-upper-stem-diameter diameter prediction RMSEs for taper models investigated in previous studies

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

Author and year

RMSE units

RMSE

Model without upper stem diameter

Model with upper stem diameter

Kozak (1998)a

%

12.56

9.91

Kozak (1998)a

%

10.80

8.45

Sharma and Parton (2009)a

\( \frac{\mathrm{dob}}{\mathrm{dbh}} \)

0.787

0.5909

Sharma and Parton (2009)a

\( \frac{\mathrm{dob}}{\mathrm{dbh}} \)

0.4915

0.3764

Yang et al. (2009)

cm

0.7681

0.6708

Gómez-García et al. (2013)

cm

1.55

1.43

  1. The studies included in this table are those where a range of upper stem diameters were investigated and RMSE reported. The ‘with-upper-stem-diameter’ model included in the table was the best performing upper stem diameter in the cited study
  2. aFor these authors, the second citation of the same author provides information on a second species that was investigated in the same study