Class	Components	Spearman’s rho	Kendall’s tau	\(\mathbf{\widehat{\sum}^{\text{Normal}}}\)	\(\mathbf{\widehat{\sum}^{\text{Student}}}\)
	(2,1)	− 0.450	− 0.310	− 0.45	− 0.45
	(3,1)	− 0.147	− 0.097	− 0.14	− 0.14
	(4,1)	− 0.078	− 0.051	− 0.10	− 0.10
	(5,1)	0.024	0.018	0.00	0.00
AB	(3,2)	0.202	0.136	0.18	0.18
	(4,2)	0.247	0.167	0.19	0.19
	(5,2)	0.163	0.108	0.09	0.09
	(4,3)	0.141	0.096	0.06	0.06
	(5,3)	0.231	0.158	0.27	0.27
	(5,4)	0.223	0.156	0.11	0.11
	(2,1)	− 0.559	− 0.392	− 0.56	− 0.56
	(3,1)	− 0.191	− 0.129	− 0.20	− 0.20
BI	(4,1)	− 0.135	− 0.092	− 0.09	− 0.09
	(3,2)	− 0.089	− 0.059	− 0.24	− 0.24
	(4,2)	− 0.014	− 0.010	− 0.04	− 0.03
	(4,3)	− 0.121	− 0.081	− 0.36	− 0.37
APD	(2,1)	− 0.776	− 0.597	− 0.69	− 0.70