Table 3 Summary statistics of the calibration and validation datasets (mean, min-max)
From: Validation of models predicting modulus of elasticity in Douglas-fir trees, boles, and logs
Trees | Boles | Logs | ||||
|---|---|---|---|---|---|---|
Variablea | Calibration | Validation | Calibration | Validation | Calibration | Validation |
N = 139 | N = 23 | N = 137 | N = 23 | N = 481 | N = 78 | |
V (km s−1) | 3.86 | 3.87 | 3.59 | 3.74 | 3.53 | 3.68 |
2.53–4.44 | 2.92–4.50 | 3.08–4.12 | 3.37–4.12 | 2.77–4.18 | 3.24–4.02 | |
D (cm) | 39.0 | 33.3 | 41.5 | 37.1 | 33.8 | 30.1 |
20.8–60.7 | 21.6–46.0 | 21.2–62.9 | 25.5–48.8 | 17.3–62.9 | 18.5–48.8 | |
H (m)b | 32.1 | 33.3 | 25.0 | 24.9 | 0.23 | 0.23 |
21.9–43.6 | 27.1–39.7 | 16.5–35.4 | 14.3–32.6 | 0.00–0.73 | 0.01–0.56 | |
T (cm m−1) | 1.22 | 1.00 | 1.68 | 1.49 | 1.12 | 0.92 |
0.74–2.07 | 0.73–1.17 | 1.01–2.91 | 1.20–1.78 | 0.00–3.92 | 0.21–2.18 | |
ρ (kg m−3) | 805 | 809 | 804 | 809 | 805 | 801 |
674–902 | 708–878 | 674–902 | 708–878 | 634–986 | 666–952 | |
A (years) | 44 | 44 | 41 | 40 | 32 | 33 |
36–51 | 36–51 | 33–48 | 34–47 | 13–48 | 17–47 | |
E (GPa) | 12.1 | 12.2 | 10.4 | 11.4 | 10.0 | 10.8 |
5.3–16.4 | 6.9–16.4 | 7.3–13.7 | 8.9–13.4 | 5.8–13.6 | 8.4–12.7 | |
MOE (GPa) | 10.4 | 10.9 | 10.4 | 10.9 | 10.3 | 10.8 |
6.1–15.1 | 8.5–12.8 | 6.1–15.1 | 8.5–12.8 | 4.6–16.7 | 6.1–14.5 | |