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

Table 5

Sample sequence pure randomness test.

Items	To lag	Chi-squared	Freedom
Replacement of expansion joints	6	18.65	6	0.0048
Repair of expansion joints concrete	6	29.62	6	<0.0001
Maintenance of steel handrails	6	32.25	6	<0.0001

is the significance of the chi-squared test in a pure random test.