A New Plant Indicator (Artemisia lavandulaefolia DC.) of Mercury in Soil Developed by Fourier-Transform Near-Infrared Spectroscopy Coupled with Least Squares Support Vector Machine

Table 1

Classification of regular and mercury-contaminated ALDC samples by FT-NIR and LS-SVM.

Preprocessing	Parameters (σ^2, γ)	Error rates of cross validation	Prediction accuracy
Raw data LS-SVM	(840, 2.5)	0.075	0.912
Smoothing-LS-SVM	(800, 4.0)	0.069	0.875
D2-LS-SVM	(450, 7.5)	0.038	0.950
SNV-LS-SVM	(720, 4.5)	0.044	0.925