Research Article
An Effective Approach to Input Variable Selection for Preliminary Cost Estimation of Construction Projects
Table 3
Variable groups and coefficients.
| | Variable group | Eigenvalue | Variance (%) | Input variables | Variable coefficients |
| | Variable group (V1) | | | Project size | | | Project type | | | Project complexity | | | Project scope | | | Project duration | | | Project location | | | Bridge type | | | Number of bridges | |
| | Variable group (V2) | | | Existence of groundwater | | | Bridge type | | | Number of bridges | | | Soil type | |
| | Variable group (V3) | | | Project location | | | Inflation rate | | | Site topography | | | Soil type | |
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Input variables which are clustered more than one variable group. |
