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

Table 5.

PLS values of sugar content prediction of the potato variety Lady Claire.

PLS Score		Glucose			Fructose			Fructose + Glucose
PLS Score		PDTE	PDTP	PDTC	PDTE	PDTP	PDTC	PDTE	PDTP	PDTC
Spectra	CAL	396	393	408	408	411	411	414	411	393
Spectra	VAL	96	105	102	99	105	102	102	105	96
Averaged spectra	CAL	132 (140) ¹	131 (140)	136 (140)	136 (140)	137 (140)	137 (140)	138 (140)	137 (140)	131 (140)
Averaged spectra	VAL	32 (35)	35 (35)	34 (35)	33 (35)	35 (35)	34 (35)	34 (35)	35 (35)	32 (35)
WL (cm⁻¹)		7502.2–6098.2	9403.8–7498.4	9403.8–7498.4; 6102.1–5446.3	9403.8–6098.2	9403.8–7498.4; 4601.6–4246.8	9403.8–7498.4; 6102.1–5446.3	9403.8–7498.4	6102.1–5446.3	9403.8–7498.4; 6102.1–5446.3
LV		6	5	6	9	14	6	5	5	7
R²	CAL	0.55	0.57	0.61	0.57	0.64	0.59	0.45	0.38	0.64
R²	VAL	0.57	0.52	0.61	0.67	0.70	0.63	0.50	0.63	0.58
RMSE (%)	CAL	0.015	0.018	0.018	0.020	0.019	0.018	0.045	0.047	0.028
RMSE (%)	VAL	0.016	0.014	0.018	0.016	0.017	0.018	0.044	0.036	0.026
RPD	CAL	1.49	1.52	1.6	1.74	1.68	1.56	1.35	1.27	1.66
RPD	VAL	1.56	1.47	1.62	1.52	1.83	1.66	1.43	1.64	1.61
Data Preprocessing		D1 + SNV	LOS	SLS	MMN	D1	SNV	SNV	None	LOS
Sugar values (% FW)	CAL	0–0.103	0–0.131	0–0.131	0–0.138	0–0.147	0–0.138	0–0.300	0–0.279	0–0.202
Sugar values (% FW)	VAL	0–0.102	0–0.077	0–0.117	0–0.122	0–0.122	0–0.122	0–0.239	0–0.239	0–0.144

¹ number of averaged spectra or potatoes 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; SNV: Vector normalization; LOS: Linear offset subtraction; MMN: Min–Max Normalization; D1: first derivative; SLS: Straight line subtraction.