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

Table 1

Hierarchical regression analysis results of the RC beam bridge.

Variables in the model		Group 1			Group 2			Group 3 (1)
		β			β			β
Independent variables	Shanbei	0.02	0.099	0.922	0.128	0.785	0.439	0.22	1.136	0.888
	Guanzhong	0.002	0.012	0.991	−0.071	−0.442	0.662	−0.051	−0.311	0.265
	Age				0.631	4.174	0	0.606	3.921	0.758
	AADT							0.161	−0.137	0.001
Model summary of the model	R^2	0			0.375			0.393
	Adjusted R^2	−0.066			0.311			0.306
		0.995			0.003			0.006
		0			0.375			0.017
		0.995			0			0.382