Table 11.

Equations for estimating the chromatic coordinates and the chroma C of olive oil, measuring the absorbance at only 480 nm and 670 nm [76].

Equation	R2	SEE a	RMSE b
L* = 0.556458(A480)2 − 2.51145A480 + 0.55504(A670)2 − 8.53016A670 + 98.4089	0.914	0.74	0.83
a* = 0.177372(A480)2 + 2.1363A480 + 1.43254(A670)2 − 0.789231A670 − 13.9246	0.881	0.54	0.72
b* = −16.0277(A480)2 + 79.8932A480 − 5.06558(A670)2 + 3.36169A670 + 31.9405	0.992	1.28	1.28
C = −15.8439(A480)2 + 78.9312A480 − 5.26784(A670)2 + 3.56917A670 + 33.3927	0.992	1.28	1.29

^a Standard error of the estimate. ^b Root mean squared error.