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Table 2 Coefficients of the mixed-effects diameter increment models

From: Evaluation of different approaches to individual tree growth and survival modelling using data collected at irregular intervals – a case study for Pinus patula in Kenya

  Modelling approach
Predictor Regression 1 Regression 2 Optimization
Constant –1.07845 –2.24497 0.59149
ln(d) 0.92911 1.49389 1.08691
d –0.02068 –0.04632 –0.07473
BAL –0.02316 –0.03033 –0.04719
√G -0.28039 –0.17988 –0.32857
Step 0.12559
Period 1 (1974–1975) 0.45783 –0.45064 –0.27558
Period 2 (1975–1976) 0.6025 –0.03065 –0.28573
Period 3 (1976–1977) 0.42677 –0.08639 –0.10036
Period 4 (1977–1978) 0.70895 0.24015 0.25214
Period 5 (1978–1979) 0.53579 –0.02277 0.09960
Period 6 (1979–1980) 0.17169 –0.16441 0.18685
Period 7 (1979–1983) –0.08124 0.41545 –0.03458
Period 8 (1980–1983) 0.05176 0.32957 –0.32634
Period 9 (1983–1990) –0.14420 0.43467 –0.06149
Period 10 (1983–1991) –0.40772 0.47512 –0.40811
Period 11 (1983–1996) –0.78327 –0.31606 –0.56516
Period 12 (1990–1996) –0.65995 –0.22321 –0.52835
Period 13 (1991–1996) –0.87891 –0.95390 –0.65856
  1. d = diameter at breast height; BAL = basal area in larger trees; G = stand basal area.