. 2019 Mar 9;24(5):967. doi: 10.3390/molecules24050967

Table 4.

PLS values of sugar content prediction of the potato variety Markies.

PLS Score		Glucose			Fructose			Fructose + Glucose
PLS Score		PDTE	PDTP	PDTC	PDTE	PDTP	PDTC	PDTE	PDTP	PDTC
Spectra	CAL	402	396	405	405	405	405	411	405	405
Spectra	VAL	102	102	102	102	99	99	102	99	102
Averaged spectra	CAL	134 (140) ¹	132 (140)	135 (140)	135 (140)	135 (140)	135 (140)	137 (140)	135 (140)	135 (140)
Averaged spectra	VAL	34 (35)	34 (35)	34 (35)	34 (35)	33 (35)	33 (35)	34 (35)	33 (35)	34 (35)
WL (cm⁻¹)		8451.1–7498.4	9403.8–8451.1; 6102.1–5774.2	9403.8–8451.1; 6102.1–5446.3	8451.1–7498.4	9403.8–8451.1; 6102.1–5774.2	9403.8–7498.4; 5774.2–5446.3	8451.1–7498.4	9403.8–7498.4; 6102.1–5446.3	9403.8–7498.4; 5774.2–5446.3
LV		5	9	4	3	9	9	3	5	5
R²	CAL	0.71	0.83	0.72	0.61	0.83	0.88	0.55	0.81	0.78
R²	VAL	0.80	0.75	0.70	0.75	0.81	0.77	0.77	0.78	0.71
RMSE (%)	CAL	0.019	0.013	0.019	0.022	0.016	0.013	0.051	0.031	0.034
RMSE (%)	VAL	0.015	0.017	0.019	0.018	0.016	0.017	0.033	0.033	0.037
RPD	CAL	1.86	2.4	1.89	1.6	2.39	2.94	1.5	2.31	2.14
RPD	VAL	2.29	2.14	1.83	2.01	2.4	2.11	2.09	2.15	1.85
Data Preprocessing		SLS	None	MSC	1st der.	None	None	1st der.	D1 + MSC	MSC
Sugar values (% FW)	CAL	0–0.165	0–0.128	0–0.165	0–0.173	0–0.173	0–0.173	0–0.338	0–0.338	0–0.338
Sugar values (% FW)	VAL	0–0.115	0–0.115	0–0.115	0–0.119	0–0.119	0–0.119	0–0.235	0–0.235	0–0.235

¹ number of averaged spectra (tubers) before elimination of outlayers. CAL: calibration, VAL: validation; spectra: number of spectra or potato samples; LV: the number of latent variables; R²: determination coefficient; RMSE: root mean square error; RPD: ratio performance to deviation; MSC: Multiplicative scatter correction; 1st der.: first derivative; SLS: Straight line subtraction.