Prediction Methods for Routine Maintenance Costs of a Reinforced Concrete Beam Bridge Based on Panel Data

Table 3

Summary of actual and predicted costs based on nonlinear regression and test results.

Project		Age (years)	Bridge length (km)	Number of lanes	Predicted value	Actual value
Shang Man	2016	8	37.85	4	692160	424724
	2017	9	37.85	4	721450	818112
Shang Jie	2016	9	45.34	6	1296322	1463289
	2017	10	45.34	6	1351179	1998922
Xi Shang	2016	5	56.13	6	1359648	1845905
	2017	6	56.13	6	1417186	1464380
An Chuang	2016	6	75.966	4	1278673	1233239
	2017	7	75.966	4	1332784	1130645
Results of the Wilcoxon signed-rank test
Correlation coefficient			Statistical significance of the correlation coefficient		Statistical significance of the Wilcoxon signed-rank test
0.83			0.01		0.44