Identifying the Geographical Origin of Tobacco Leaf by Strontium and Lead Isotopic with Mineral Elemental Fingerprint

Table 4

The validation of fisher’s linear discrimination functions.

Authentication method	Statistics	Geo-origin	Predicted group membership						Total
			Argentina	Brazil	Zimbabwe	U.S.	Zambia	China
Initial verification^a	Discriminate number	Argentina	12	0	0	0	0	0	12
		Brazil	0	10	0	0	0	0	10
		Zimbabwe	0	0	17	0	0	0	17
		U.S.	0	0	0	6	0	0	6
		Zambia	0	0	0	0	8	0	8
		China	1	0	0	0	0	27	28
	Discriminate accuracy%	Argentina	100.0	0.0	0.0	0.0	0.0	0.0	100.0
		Brazil	0.0	100.0	0.0	0.0	0.0	0.0	100.0
		Zimbabwe	0.0	0.0	100.0	0.0	0.0	0.0	100.0
		U.S.	0.0	0.0	0.0	100.0	0.0	0.0	100.0
		Zambia	0.0	0.0	0.0	0.0	100.0	0.0	100.0
		China	3.6	0.0	0.0	0.0	0.0	96.4	100.0
Cross-validation(leave a law)^b	Discriminate number	Argentina	12	0	0	0	0	0	12
		Brazil	0	10	0	0	0	0	10
		Zimbabwe	0	0	17	0	0	0	17
		U.S.	0	0	0	6	0	0	6
		Zambia	0	0	0	0	8	0	8
		China	3	0	0	1	0	24	28
	Discriminate accuracy%	Argentina	100.0	0.0	0.0	0.0	0.0	0.0	100.0
		Brazil	0.0	100.0	0.0	0.0	0.0	0.0	100.0
		Zimbabwe	0.0	0.0	100.0	0.0	0.0	0.0	100.0
		U.S.	0.0	0.0	0.0	100.0	0.0	0.0	100.0
		Zambia	0.0	0.0	0.0	0.0	100	0	100.0
		China	10.7	0	0	3.6	0	85.7	100.0

a is the total initial determination accuracy is 98.8%. ^b the total cross-discrimination accuracy rate is 95.1%.