Table 7 Parameter estimates for sub-model 3. The model predicts the sheath to breast height wood density ratio as a function of breast height ring number from pith, and was fitted to Douglas-fir data from eight sites in New Zealand. The model R2 = 0.49
From: Predicting wood density of growth increments of Douglas-fir stands in New Zealand
Parameter | Estimate | Std. error | t value | p value |
|---|---|---|---|---|
a3 | 1.094 | 0.021 | 51.15 | < 0.0001 |
b3 | − 0.0277 | 0.0059 | − 4.67 | 0.042 |