Table 4.

Error indices for predicted values of citric acid

Model	Bias	r	RMSE	SI
LR	0.50	0.89	6.81	0.16
ANN	2.29	0.90	6.59	0.15
SVM	0.27	0.89	7.22	0.17
RF	0.25	0.87	8.16	0.19

RMSE=Root means square error, SI=Scatter index, LR=Linear regression, ANN=Artificial neural network, SVM=Support vector machine, RF=Random forrest