Research Article
Machine Learning and Statistical Test–Based Culvert Condition Impact Factor Analysis
Table 5
Summary of p Values from the Mann–Whitney U test.
| Material | Variable | Condition rating | MC | CA | SOJ | SC |
| Concrete | Age | 0.001 | 0.001 | 0.001 | 0.001 | Span | 0.001 | 0.001 | 0.001 | 0.001 | Rise | 0.001 | 0.001 | 0.001 | 0.001 | Cover height | 0.001 | 0.131 | 0.213 | 0.003 | pH | 0.001 | 0.001 | 0.001 | 0.001 |
| Corrugated metal | Age | 0.001 | 0.001 | 0.001 | 0.009 | Span | 0.007 | 0.885 | 0.001 | 0.002 | Rise | 0.085 | 0.99 | 0.002 | 0.001 | Cover height | 0.117 | 0.002 | 0.001 | 0.001 | pH | 0.001 | 0.001 | 0.001 | 0.001 |
| Corrugated plastic | Age | 0.001 | 0.001 | 0.001 | 0.001 | Span | 0.883 | 0.001 | 0.109 | 0.001 | Rise | 0.788 | 0.001 | 0.127 | 0.001 | Cover height | 0.072 | 0.37 | 0.001 | 0.001 | pH | 0.445 | 0.294 | 0.213 | 0.001 |
| Vitrified clay | Age | 0.75 | 0.245 | 0.249 | 0.597 | Span | 0.194 | 0.083 | 0.114 | 0.142 | Rise | 0.217 | 0.096 | 0.12 | 0.128 | Cover height | 0.006 | 0.043 | 0.822 | 0.001 | pH | 0.002 | 0.008 | 0.001 | 0.001 |
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