A New Strategy for Quality Evaluation and Identification of Representative Chemical Components in Polygonum multiflorum Thunb.

Table 4

Principal component analysis of 25 batches of RHSW.

Principal component	Eigenvalue	Variance contribution rate/%	Cumulative contribution rate/%
	5.096	31.852	31.852
	2.741	17.134	48.986
	1.722	10.763	59.749
	1.431	8.942	68.691
	1.238	7.738	76.429
	0.944	5.901	82.33

RHSW: raw Polygonum multiflorum Thunb.