Table 1. Characterization of each discriminant function using the different elemental denominations.

Ratio of each element	Valid data1 (%)	Eigen value	Number of ratios used	Successive discrimination (%)
No ratio	100.0	1.297	11	87.5
To Zr	97.4	1.045	8	87.6
To P	100.0	0.618	12	84.9
To Ag	82.0	0.914	12	85.9
To Cd	93.7	0.809	13	85.5
To Sn	87.8	0.725	14	84.1
To Sb	87.8	0.684	12	83.8
Combined2	79.4	1.526	24	89.8

(P = phosphorous, Zr = zirconium, Ag = silver, Cd = cadmium, Sn = tin, Sb = antimony).

¹Accepted data for entering into discriminant analysis.

²Ratios of Zr, P, Ag, Cd, Sn and Sb were pooled before analyzing through discriminant analysis.