Table 3.

Performance of the PLS regression model for predicting aphid number by selected SVM_b classifier

Pre-processing method	LV	$R^{2}Cal$	RMSEC	$R^{2}CV$	RMSECV	$R^{2}Prediction$	RMSEP
Raw	27	0.86	8.25	0.62	15.22	0.61	14.56
SNV	19	0.88	7.96	0.57	16.93	0.81	10.29
Log(1/R)	46	0.76	12.25	0.63	17.92	0.61	13.71
First derivative	26	0.83	9.94	0.61	17.51	0.80	11.29
Second derivative	18	0.83	9.61	0.42	19.47	0.75	11.37

Bold values demonstrate the best performance model