Assessment of Dairy Product Safety Supervision in Sales Link: A Fuzzy-ANP Comprehensive Evaluation Method

Table 6

Test of reliability and validity.

Subject of investigation	Cronbach’s alpha^1	KMO^2	Bartlett’s test of sphericity^3
			Approximately chi-square	df	Significance
Offline dairy business	0.957	0.951	92336.27	1275	0.000
Online dairy business	0.978	0.965	23171.39	1275	0.000
Whole dairy business	0.975	0.972	111604.5	1275	0.000

¹Cronbach’s alpha is the most commonly used method of reliability measurement, and its value is usually between 0 and 1. If the alpha coefficient is not more than 0.6, it is generally considered that the internal consistent reliability is insufficient; the expression scale is quite reliable when it reaches 0.7-0.8, and the reliability of the scale is very good when it reaches 0.8-0.9 [79]. ²The KMO (Kaiser–Meyer–Olkin) is an important index for testing validity of questionnaires. It is used to compare simple correlation coefficient and partial correlation coefficient among variables. If KMO > 0.9, the correlation between variables is very strong; if 0.9 > KMO > 0.8, the correlation between variables is strong; if 0.8 > KMO > 0.7, the correlation among variables is general; if 0.7 > KMO > 0.6, the correlation between variables is weak; and if HMO is less than 0.6, there is no correlation between variables [80]. ³Bartlett’s test of sphericity is a test method to examine the correlation degree among variables. Its statistic is based on the determinant of the correlation coefficient matrix. If the value is larger and its corresponding companion probability is less than the significant level in the user’s mind, then the zero hypothesis should be rejected, that is, the correlation between the original variables. On the contrary, it is not suitable for factor analysis [81].