Table 1.

Near-infrared reflectance spectroscopic (NIRS) calibration and cross validation statistics for seed oil, protein, carbon, and nitrogen contents (%).

	Calibration						Cross-validation		External validation
	n	Mean (%)	Range (%)	SD	PLS factors	SEC	${\mathbf{r}}_{\mathbf{C}}^{\mathbf{2}}$	SECV	${\mathbf{r}}_{\mathbf{C}\mathbf{V}}^{\mathbf{2}}$	n	Mean (%)	SD	SEP	${\mathbf{r}}_{\mathbf{V}}^{\mathbf{2}}$	RPD
Oil	112	38.78	18.70–46.90	3.88	5	0.541	0.98	0.606	0.98	36	38.45	4.39	0.505	0.99	7.68
Protein	98	19.99	11.89–27.73	3.39	3	1.219	0.88	1.287	0.85	33	19.73	3.32	1.228	0.86	2.76
Carbon	91	57.39	51.41–60.69	1.25	3	0.424	0.88	0.460	0.86	30	57.39	1.04	0.432	0.82	2.90
Nitrogen	90	4.34	3.14–5.52	0.43	4	0.081	0.96	0.091	0.95	30	4.32	0.41	0.087	0.96	4.91

n, number of samples; SD, standard deviation; PLS, partial least square; SEC, standard error of calibration; ${\mathit{r}}_{\mathit{C}}^{\mathrm{2}}$, coefficient of determination in calibration; SECV, standard error of cross-validation; ${\mathit{r}}_{\mathit{C}\mathit{V}}^{\mathrm{2}}$, coefficient of determination in cross-validation; ${\mathit{r}}_{\mathit{V}}^{\mathrm{2}}$, coefficient of determination in validation; SEP, standard error of prediction; RPD, ratio of performance deviation (SD/SEP).