Table 2. Calibration statistics for analysis of bovine milk content (% vol/vol) in bufalin milk using partial least square (PLS) regression at frequencies 2,989.12ā2,495.44 and 1,481.06ā987.38 cmā1
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.