Runoff Purification Effects of Permeable Concrete Modified by Diatomite and Zeolite Powder

Table 9

Correlation degree of gray correlation analysis.

Correlation coefficient	Correlation degree (ri)
ξ1 = (1.000, 0.791, 0.333)	0.708
ξ2 = (1.000, 0.818, 0.447)	0.755
ξ3 = (1.000, 0.986, 0.727)	0.905
ξ4 = (1.000, 0.742, 0.758)	0.833
ξ5 = (1.000, 0.923, 0.465)	0.796
ξ6 = (1.000, 0.837, 0.667)	0.835
ξ7 = (1.000, 0.626, 0.503)	0.710
ξ8 = (1.000, 0.960, 0.541)	0.834
ξ9 = (1.000, 0.837, 0.960)	0.932
ξ10 = (1.000, 0.667, 0.758)	0.808
ξ11 = (1.000, 0.900, 0.727)	0.876
ξ12 = (1.000, 0.735, 0.973)	0.903
ξ13 = (1.000, 0.610, 0.526)	0.712