Table 3.

Eigen values and contribution rates of principal components.

Component	Initial eigenvalues	Contribution rate of variance (%)	Cumulative variance contribution rate (%)
1	4.224	38.402	38.402
2	3.529	32.085	70.487
3	1.676	15.238	85.725
4	0.66	6.002	91.728
5	0.504	4.582	96.31
6	0.289	2.624	98.934
7	0.097	0.881	99.815
8	0.013	0.123	99.938
9	0.007	0.062	100
10	−3.21E-17	−2.92E-16	100
11	−3.72E-16	−3.38E-15	100