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

Table 5

Standardization of raw data.

Year	zx1	zx2	zx3	zx4	zx5	zx6	zx7	zx8	zx9
2009	−0.339	1.407	−0.771	−0.865	−2.579	−1.028	−1.17	−0.645	−1.143
2010	−0.962	1.407	−0.816	−0.663	−0.832	−2.592	−2.084	−1.385	−1.382
2011	−0.861	0.749	−0.732	−0.793	−0.333	0.184	−0.696	−1.196	−0.545
2012	2.434	0.419	−0.642	−0.728	0.083	0.151	0.646	−0.803	−0.874
2013	−0.993	0.09	−0.612	−0.727	0.067	0.712	0.726	−0.677	−0.844
2014	0.653	0.09	−0.411	−0.397	0.271	0.164	0.228	−0.299	0.143
2015	0.515	−0.24	−0.313	−0.335	0.279	0.066	−0.632	0.85	0.203
2016	0.399	−0.24	−0.002	0.054	0.598	1.011	−0.757	1.023	1.025
2017	−0.647	−0.569	0.777	1.087	0.679	0.516	0.776	1.023	1.13
2018	−0.201	−1.557	1.352	1.72	0.851	0.457	0.786	1.023	1.13
2019	0.004	−1.557	2.172	1.647	0.916	0.36	0.786	1.086	1.16