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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