Table 5.

Coefficient of rank correlation (r) of results of three methods in 2011

Items	RA	SFA		DEA
		Index screening	Principal component	Index screening	Principal component
RA	–	0.149	0.049	0.553*	0.529*
SFA
Index screening	0.149	–	0.842*	0.490*	0.619*
Principal component	0.049	0.842*	–	0.292*	0.470*
DEA
Index screening	0.553*	0.490*	0.292*	–	0.610*
Principal component	0.529*	0.619*	0.470*	0.610*	–

*P<0.05. RA: Ratio analysis; SFA: Stochastic frontier analysis; DEA: Data envelopment analysis.