Classification of Geological Samples Based on Soft Independent Modeling of Class Analogy Using Laser-Induced Breakdown Spectroscopy

Figure 4

(a) A recombination of selected spectral variables in Table 2 for the tektite sample; (b) PC1 loading plot; (c) PC2 loading plot; (d) PC3 loading plot. Comparison between the PCA loading plots of the first three principal components is shown, the percentages represent the explained variance for each principal component. These three principal components, combined, explain 65.35% of the net variance in the data set. The loadings were compared to the recombined spectrum in order to observe the variables in the spectrum that contribute to classification.