Table 3.

Fitting statistics of prediction models for ground cocoa traits developed using cross-validation results for benchtop (NIR FOSS DS 2500) and portable (PoliSpec NIR) NIR-spectrometers.

FOSS DS 2500
Math Treatment		Constituent	N	Mean	SD	SEcal	R2cal	SEcv	R2cv	RPD
NONE	1441	Fat	56	2.45	0.27	0.11	0.84	0.13	0.76	2.11
SNV_DET	0011	Protein	54	0.77	0.11	0.02	0.95	0.03	0.91	3.40
NONE	2551	TPC	55	3.04	0.65	0.51	0.40	0.59	0.16	1.10
MSC	0011	pH	50	5.57	0.37	0.08	0.95	0.13	0.88	2.96
NONE	1441	TA	52	16.69	3.86	0.80	0.96	1.43	0.86	2.70
NONE	1441	FI	55	1.29	0.50	0.27	0.70	0.38	0.42	1.31
MSC	0011	DM	56	94.51	0.59	0.15	0.94	0.18	0.90	3.20
MSC	0011	Ash	50	0.16	0.03	0.01	0.90	0.01	0.89	2.98
PoliSPEC-NIR
Math Treatment		Constituent	N	Mean	SD	SEcal	R2cal	SEcv	R2cv	RPD
NONE	2551	Fat	52	2.45	0.27	0.09	0.88	0.12	0.82	2.34
NONE	0011	Protein	53	0.77	0.11	0.04	0.84	0.05	0.79	2.17
MSC	0011	TPC	55	3.04	0.65	0.50	0.42	0.57	0.23	1.14
NONE	1441	pH	53	5.56	0.36	0.11	0.90	0.18	0.74	1.98
NONE	0011	TA	51	17.23	4.07	1.14	0.92	1.76	0.81	2.32
NONE	0011	FI	56	1.29	0.49	0.41	0.33	0.42	0.26	1.17
NONE	0011	DM	54	94.54	0.59	0.25	0.81	0.27	0.79	2.17
NONE	1441	Ash	54	0.16	0.03	0.01	0.89	0.01	0.76	2.08

NONE = no correction; SNV_DET = SNV and detrend; MSC = multiplicative scatter correction; SD = standard deviation of reference data selected; SEcal = standard error in calibration; R²cal = coefficient of determination of calibration; SEcv = standard error in cross-validation; R²cv = coefficient of determination of cross-validation. TPC = total phenolic compound; TA = titratable acidity; FI = fermentation index; DM = dry matter.