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Table 2 Parameters estimation and significance of the aboveground biomass model with forest management type 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 = 1863, RMSE = 97.08, R2 = 0.46
Intercept (Production) −71.056 8.864 − 8.016 1.91e–15
Protected −9.75 23.725 − 0.411 0.681
Protection 5.528 6.787 0.814 0.415
Age 0.471 0.118 3.993 6.79e–05
Dominant height 1.249 0.041 30.496 < 2e–16
With harvest: no age filter
N = 2703, RMSE = 113.30, R2 = 0.43
Intercept (Production) −76.142 8.311 −9.161 < 2e–16
Protected 15.438 19.839 0.778 0.437
Protection 16.943 6.050 2.800 0.005
Age 0.257 0.074 3.472 5.25e–05
Dominant height 1.323 0.036 36.764 < 2e–16