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Table 3 Standard errors, explained deviance and AIC of shape constrained and unconstrained generalized h-d models for spruce, pine and birch in Norway

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

  Spruce Pine Birch
Standard error (m)
gam 2.06 2.33 1.64
scam (Eq. 8) 2.07 2.34 1.64
gamm (Eq. 7) prediction based on fixed-effects 2.09 2.36 1.64
gamm (Eq. 7) 1.38 1.30 1.04
scam_m (Eq. 6) 1.40 1.33 1.01
Explained deviance (%)
gam 87.8 80.3 78.0
scam (Eq. 8) 87.7 80.2 77.8
gamm (Eq. 7) 94.1 93.3 90.4
scam_m (Eq. 6) 94.0 93.1 90.4
AIC
gam 284,162.3 225,179.1 215,256.8
scam 284,307.9 225,267.6 215,701.0
 AIC scam in proportion to gam (%) 100.05 100.04 100.21