Journal of Analytical Methods in Chemistry / 2014 / Article / Fig 3

Research Article

Global Clustering Quality Coefficient Assessing the Efficiency of PCA Class Assignment

Figure 3

Estimated density distributions calculated with the (a) PC1 scores and (b) PC2 scores associated with stimulant amphetamines (class M), hallucinogens (class T), and negatives (class N) in the case of unprocessed spectra.
342497.fig.003a
(a)
342497.fig.003b
(b)