Discrimination of Salvia miltiorrhiza Bunge from Different Geographical Locations Employing High-Performance Liquid Chromatography, Near-Infrared Fingerprinting Combined with Chemometrics

Table 5

The effects of different spectrum pretreated methods on the performance index.

Spectral preprocessing method	Performance index (PI)
MSC + spectrum + Ns^1	93.2 ± 0.01
MSC + spectrum + S-G	93.2 ± 0.02
MSC + FD + Ns	94.6 ± 0.04
MSC + FD + S-G	94.5 ± 0.03
MSC + FD + Nd	95.0 ± 0.02
MSC + SD + Ns	94.8 ± 0.02
MSC + SD + S-G	95.3 ± 0.04
MSC + SD + Nd	94.6 ± 0.02

¹NS, no smoothing.