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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)