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New Zealand Journal of Forestry Science

Table 7 Parameter estimates and their standard errors and tests of significance for the model Eq. (4) to predict the radial variation in wood density

From: Modelling the variation in wood density of New Zealand-grown Douglas-fir

Parameter

Estimate

Std. error

t Value

p Value

a

432.6

6.5

66.23

<0.0001

b

1.22

0.20

6.11

<0.0001

c

0.0235

0.0062

3.81

0.0003

d

0.0125

0.0026

4.82

<0.0001

f

0.221

0.017

13.21

<0.0001

g

0.814

0.089

9.24

<0.0001

h

0.258

0.040

6.47

<0.0001

\( {\sigma}_{s \tan d}^2 \)

702

24

28.78

<0.0001

\( {\sigma}_e^2 \)

2155

347

6.22

<0.0001

  1. Estimates of the between stand variance (\( {\sigma}_{s \tan d}^2 \)) and within-radial error term variance (\( {\sigma}_e^2 \)) for the local parameter L are also given
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