Table 3. PLS-DA Cross-Validation Results from the SERS-Based Analysis of Four Colorants on Hair of Different Races/ethnicities, Sexes, and Age Groups.

SERS (LV = 3)		actual colorant
predicted colorant	accuracy, %	PBA (n = 500)	PBU (n = 500)	SBA (n = 500)	SBU (n = 500)
PBA	100	500	1	0	0
PBU	99.8	0	499	0	0
SBA	99.6	0	0	498	0
SBU	100	0	0	2	500