Table 2. Calibration statistics for analysis of bovine milk content (% vol/vol) in bufalin milk using partial least square (PLS) regression at frequencies 2,989.12ā€“2,495.44 and 1,481.06ā€“987.38 cmāˆ’1

Spectral treatment R2 cal RMSEC R2 val RMSEP RMSECV NĀ° of factors
Normal 0.99857 2.08 0.99770 6.06 2.63 10
First derivative, Norris filter 0.99861 2.04 0.99803 2.84 2.44 9
R2 cal, coefficient of determination for calibration; RMSEC, root mean square error of calibration; R2 val, coefficient of determination for external validation; RMSEP, root mean square error of prediction; RMSECV, root mean square of cross-validation.