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Table 4 Estimated parameters for the variance components (standard deviation SD) and dispersion parameter for shape constrained and unconstrained generalized h-d models for spruce, pine and birch in Norway. Lower and upper limits for the 0.95% confidence intervals are given in brackets

From: Longitudinal height-diameter curves for Norway spruce, Scots pine and silver birch in Norway based on shape constraint additive regression models

  SD(α k ) SD(β k ) Dispersion parameter ϕ
Spruce
gamm (Eq. 7) 0.1159 (0.1129, 0.1189) 0.1330 (0.1287, 0.1375) 0.0132 (0.0130, 0.0133)
scam_m (Eq. 6) 0.1102 (0.1074, 0.1131) 0.1339 (0.1296, 0.1383) 0.0134 (0.0133, 0.0136)
Pine
gamm (Eq. 7) 0.1611 (0.1572, 0.1650) 0.1733 (0.1663, 0.1805) 0.0141 (0.0139, 0.0142)
scam_m (Eq. 6) 0.1578 (0.1540, 0.1617) 0.1849 (0.1776, 0.1925) 0.0144 (0.0142, 0.0146)
Birch
gamm (Eq. 7) 0.1349 (0.1317, 0.1383) 0.0833 (0.0798, 0.0870) 0.0174 (0.0172, 0.0176)
scam_m (Eq. 6) 0.1345 (0.1313, 0.1379) 0.0864 (0.0829, 0.0901) 0.0175 (0.0173, 0.0177)