Table 2.

PLS models for predicting MetMb and MRA values on the surface layer of fresh beef with raw and pretreated spectral data.

	Pretreatment	Number of latant number	Calibration		Crossvalidation		Prediction
			R 2 c	RMSEc	R 2 cv	RMSEcv	R 2 p	RMSEp
MetMb	Raw	6	0.827	1.169	0.804	0.985	0.885	1.387
	SGS	5	0.856	0.815	0.832	0.693	0.916	0.983
	MSC	6	0.837	0.911	0.815	0.741	0.908	1.157
	Nor	5	0.846	0.894	0.797	0.733	0.911	0.9981
MAR	Raw	4	0.762	1.416	0.801	0.857	0.806	1.514
	SGS	5	0.801	1.325	0.853	1.215	0.845	1.502
	MSC	6	0.818	0.993	0.862	0.819	0.853	1.361
	Nor	6	0.836	0.869	0.887	0.786	0.871	0.908