Evaluation of Ecological Environment Quality in Chongqing Main City Area Based on Principal Component Analysis

Table 7

Correlation coefficient matrix of natural ecological environment index.

Indicators	X1	X2	X3	X4	X5	X6	X7	X8	X9
X1	1	−0.103	−0.016	−0.072	0.205	0.247	0.031	0.109	0.055
X2	−0.103	1	−0.89	−0.869	−0.833	−0.664	−0.563	−0.849	−0.889
X3	−0.016	−0.89	1	0.984	0.642	0.401	0.459	0.761	0.795
X4	−0.072	−0.869	0.984	1	0.636	0.307	0.436	0.739	0.779
X5	0.205	−0.833	0.642	0.636	1	0.654	0.624	0.643	0.765
X6	0.247	−0.664	0.401	0.307	0.654	1	0.536	0.586	0.652
X7	0.031	−0.563	0.459	0.436	0.624	0.536	1	0.132	0.338
X8	0.109	−0.849	0.761	0.739	0.643	0.586	0.132	1	0.933
X9	0.055	−0.889	0.795	0.779	0.765	0.652	0.338	0.933	1