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Table 4 Independent variables of the first stand age model. Sqrt refers to square root

From: Predicting stand age in managed forests using National Forest Inventory field data and airborne laser scanning

  Estimate Standard error t-value P-value
Intercept 2.331 0.133 17.570 < 2e–16
f_p90 0.058 0.008 7.741 3.45e–14
f_b05 0.030 0.005 5.566 3.71e–08
f_b10 −0.023 0.005 −4.253 2.40e–05
l_avg 0.426 0.066 6.483 1.70e–10
sqrt (l_max) 0.226 0.047 4.763 2.32e–06
Leica60 −0.193 0.025 −7.719 4.07e–14
mineral −1.244 0.141 −8.803 < 2e–16
sqrt (l_max × other) −0.129 0.008 −16.353 < 2e–16
sqrt (l_max_ × mineral) 0.240 0.037 6.550 1.12e–10
sqrt (l_max_ × low) 0.115 0.018 6.430 2.36e–10
l_avg × site1 −0.412 0.066 −6.247 7.29e–10
l_avg × site2 −0.431 0.065 −6.633 6.59e–11
l_avg × site3 −0.404 0.065 −6.230 8.04e–10
l_avg × site4 −0.361 0.065 −5.546 4.15e–08
l_avg × site5 −0.321 0.069 −4.643 4.11e–06