Table 3 Parameters estimation and significance of the aboveground biomass model with treatment as categorical variable before harvest (age < 100 years) and with harvest (all data)
From: Effects of forest management on biomass stocks in Romanian beech forests
Parameters | Estimate | std error | t value | Pr(>|t|) |
|---|---|---|---|---|
Before harvest: age < 100 years | ||||
N = 1608, RMSE = 96.99, R2 = 0.46 | ||||
Intercept (Age class) | −84.616 | 10.124 | −8.358 | < 2e–16 |
Shelterwood | −2.340 | 5.877 | −0.398 | 0.691 |
Age | 0.264 | 0.137 | 1.929 | 0.054 |
Dominant height | 1.237 | 0.045 | 27.350 | < 2e–16 |
With harvest: no age filter | ||||
N = 2212, RMSE = 110.76, R2 = 0.42 | ||||
Intercept (Age class) | −91.614 | 9.519 | −9.625 | 1.4e–15 |
Shelterwood | −8.830 | 5.342 | −1.653 | 0.099 |
Age | 0.122 | 0.093 | 1.311 | 0.190 |
Dominant height | 1.301 | 0.039 | 33.570 | < 2e–16 |