Research Article
An Effective Approach to Input Variable Selection for Preliminary Cost Estimation of Construction Projects
Table 9
Correlation matrix of the 12 input variables.
| | V12 | V13 | V16 | V14 | V11 | V32 | V22 | V23 | V21 | V33 | V31 | V15 |
| V12 | 1.000 | | | | | | | | | | | | V13 | 0.545 | 1.000 | | | | | | | | | | | V16 | 0.287 | 0.270 | 1.000 | | | | | | | | | | V14 | 0.381 | 0.317 | 0.380 | 1.000 | | | | | | | | | V11 | 0.425 | 0.338 | 0.347 | 0.713 | 1.000 | | | | | | | | V32 | 0.092 | −0.001 | 0.249 | 0.247 | 0.102 | 1.000 | | | | | | | V22 | 0.336 | 0.314 | 0.472 | 0.444 | 0.341 | 0.222 | 1.000 | | | | | | V23 | 0.405 | 0.360 | 0.394 | 0.438 | 0.383 | 0.242 | 0.768 | 1.000 | | | | | V21 | 0.023 | 0.043 | 0.216 | 0.325 | 0.132 | 0.325 | 0.526 | 0.353 | 1.000 | | | | V33 | 0.000 | 0.059 | 0.113 | 0.164 | 0.079 | 0.324 | 0.181 | 0.225 | 0.388 | 1.000 | | | V31 | −0.059 | −0.100 | 0.337 | 0.159 | −0.006 | 0.306 | 0.122 | 0.092 | 0.136 | 0.349 | 1.000 | | V15 | 0.248 | 0.314 | 0.234 | 0.206 | 0.362 | 0.202 | 0.273 | 0.285 | −0.013 | 0.025 | 0.083 | 1.000 |
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