TABLE 1.

Standard deviation and variance proportion of principal components for PCA feature extraction.

Principal component	1	2	3	4	5	6
Standard deviation	1.690	1.375	0.853	0.633	0.316	0.162
Variance proportion	0.476	0.315	0.121	0.067	0.016	0.004
Cumulative proportion	0.476	0.791	0.912	0.979	0.996	1.000