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Table 3 Parameter estimates and associated standard errors (s.e.) and tests of significance for the models given by Eqs. (1)–(4)

From: Modelling variation in wood density within and among trees in stands of New Zealand-grown radiata pine

Parameter Estimate s.e. t value p value
Eq. (1)
a 339.9 2.5 135.96 <0.0001
b 459.2 2.5 183.68 <0.0001
c 0.1447 0.0092 15.73 <0.0001
d 2.44 0.29 8.42 <0.0001
f 0.657 0.088 7.47 <0.0001
Eq. (2)
a 579.8 17.7 32.76 <0.0001
b −58.61 3.59 −16.33 <0.0001
c 0.002763 0.000224 12.33 <0.0001
d 80.17 4.73 16.95 <0.0001
f 0.1845 0.0260 7.10 <0.0001
Eq. (3)
a 390.3 2.2 177.41 <0.0001
b −42.30 2.67 −15.84 <0.0001
c 31.93 4.07 7.85 <0.0001
d −293.0 16.6 −17.65 <0.0001
f −0.5181 0.0307 −16.88 <0.0001
Eq. (4)
a 44.0 13.3 3.31 0.0013
b −2.34 1.10 2.13 0.036
c 0.0467 0.0218 2.14 0.035