Table 6 Parameter estimates and their standard errors and tests of significance for the regression model: (Actual – Predicted using Eq. (2)) outerwood density) = a + b × soil_C:N_ratio, based on 18 South Island sites. The model R2 is 52.4% and it has a root mean square error of 17.6 kg m−3
From: Modelling the variation in wood density of New Zealand-grown Douglas-fir
Parameter | Estimate | Std. error | t Value | p Value |
|---|---|---|---|---|
a | −75.3 | 16.7 | −4.51 | 0.0004 |
b | 3.36 | 0.80 | 4.20 | 0.0007 |