Influence of environmental factors on the detection of blood in sheep faeces using visible–near-infrared spectroscopy as a measure of Haemonchus contortus infection

Table 3 Prediction statistics for the calibration models built with Savitzky–Golay transformed spectra of faeces with various haemoglobin concentrations using the wavelength region of 387–609 nm

Calibration		Regression analysis	Latent variables (N)	Calibration		Cross-validation
Models	N	Regression analysis	Latent variables (N)	\({R^{2}}_{{{\text{cal}}}}\)	RMSEC	\({r^{2}}_{{{\text{cv}}}}\)	RMSECV
1	119	PLS	6	0.48	2.27	0.31	2.65
2	153	PLS	6	0.49	2.26	0.33	2.59

PLS, Partial least squares; \({R^{2}}_{{{\text{cal}}}}\), coefficient of determination for correlation in calibration; RMSEC, root-mean-squared error of calibration (units in µg Hb/mg faeces); \({r^{2}}_{{{\text{cv}}}}\), coefficient of determination for correlation in cross-validation; RMSECV, root-mean-squared error of cross-validation (units in µg Hb/mg faeces)

ISSN: 1756-3305