Calibrating a Local Civil Airport Runway Residual Life Prediction Model Using Random Effects and Joint Estimation

Table 2

Parameter estimation n for random-effect nonlinear mixed model.

	Estimate	Standard error	T-statistic	value	Annotation
Fix-effect parameter
k1	1.13E + 00	1.22E − 01	9.28	<0.0001	Intercept
k2	−8.37E − 02	1.12E − 02	−7.51	<0.0001	Gradient
k3	3.46E − 01	1.05E − 01	3.30	0.0013	Gradient
m1	−1.10E + 00	3.36E − 01	−3.26	0.0015	Intercept
m2	−1.05E − 01	2.88E − 02	−3.65	0.0004	Gradient
m3	1.11E + 00	2.83E − 01	3.93	0.0002	Gradient
c1	9.89E − 01	1.19E − 03	833.55	<0.0001	Intercept
μ2	−2.70E − 01	1.85E − 01	−1.46	0.1476	Bias coefficient
μ3	1.04E + 00	5.81E − 01	1.79	0.0767	Bias coefficient
λ2	5.22E − 01	2.55E − 01	2.05	0.0431	Bias coefficient
λ3	−1.84E + 00	8.00E − 01	−2.30	0.0234	Bias coefficient
Random-effect parameter
u0	2.21E − 04	1.53E − 04	1.45	0.1508	Variance
u1	1.'E − 03	3.86E − 04	3.28	0.0014	Variance
σ^2	1.57E + 00	1.52E − 01	10.33	<0.0001	Variance