Advances in Civil Engineering

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