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

Table 3.

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

PLS Score		Glucose			Fructose			Fructose + Glucose
PLS Score		PDTE	PDTP	PDTC	PDTE	PDTP	PDTC	PDTE	PDTP	PDTC
Spectra	CAL	420	405	405	402	402	405	405	405	408
Spectra	VAL	105	102	99	99	105	99	102	105	99
Averaged spectra	CAL	140 (140) ¹	135 (140)	135 (140)	134 (140)	134 (140)	135 (140)	135 (140)	135 (140)	136 (140)
Averaged spectra	VAL	35 (35)	34 (35)	33 (35)	33 (35)	35 (35)	33 (35)	34 (35)	35 (35)	33 (35)
WL (cm⁻¹)		9403.8–7498.4; 6102.1–5446.3	9403.8–7498.4; 5774.2–5446.3	9403.8–7498.4	8451.1–7498.4; 5774.2–5446.3	9403.8–7498.4	9403.8–7498.4	9403.8–7498.4; 6102.1–5446.3	9403.8–7498.4	9403.8–7498.4
LV		7	6	7	8	6	6	7	6	6
R²	CAL	0.56	0.71	0.82	0.72	0.71	0.77	0.68	0.69	0.76
R²	VAL	0.70	0.82	0.79	0.84	0.82	0.85	0.77	0.84	0.80
RMSE (%)	CAL	0.108	0.076	0.061	0.065	0.071	0.061	0.149	0.151	0.129
RMSE (%)	VAL	0.084	0.059	0.066	0.050	0.050	0.049	0.120	0.097	0.113
RPD	CAL	1.51	1.87	2.35	1.9	1.87	2.08	1.75	1.8	2.05
RPD	VAL	1.89	2.34	2.25	2.5	2.43	2.59	2.07	2.86	2.23
Data Preprocessing		SNV	SNV	LOS	MMN	None	LOS	MMN	None	LOS
Sugar values (% FW)	CAL	0–0.709	0–0.596	0–0.613	0–0.417	0–0.539	0–0.564	0–0.969	0–1.135	0–1.178
Sugar values (% FW)	VAL	0–0.494	0–0.476	0–0.493	0–0.39	0–0.39	0–0.39	0–0.779	0–0.779	0–0.779

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; SNV: Standard Normal Variate; LOS: Linear offset subtraction; MMN: Min–Max Normalization.