Table 2.

Comparison of Models Developed with the Fluorescence EEM Using Three Different Model Building Techniques: Unfolded‐PLS, NPLS, and PARAFAC‐PLS.

Model building method	Latent variables	RMSEC (g·L−1)	RMSECV (g·L−1)	${\mathrm{R}}_{\text{C}}^2$	R2CV
Lactate concentration
Unfolded PLS	9	0.65	1.06	0.975	0.935
NPLS	6	1.81	2.01	0.808	0.770
PARAFAC 3 component/PLS	3	2.82	2.91	0.533	0.502
PARAFAC 4 component/PLS	4	2.80	2.95	0.538	0.490
Glucose concentration
Unfolded PLS	4	1.36	1.53	0.560	0.442
NPLS	5	1.34	1.43	0.572	0.513
PARAFAC 3 component/PLS	2	1.86	1.91	0.166	0.130
PARAFAC 4 components/PLS	4	1.80	1.92	0.220	0.133
Ammonium concentration
Unfolded PLS	9	0.021	0.031	0.960	0.917
NPLS	6	0.041	0.054	0.850	0.748
PARAFAC 3 component/PLS	3	0.084	0.086	0.367	0.342
PARAFAC 4 components/PLS	3	0.082	0.084	0.391	0.363