Scealy, Janice; De Caritat, Patrice; Grunsky, Eric C.; Welsh, Alan; Tsagris, Michail T
Geochemical surveys collect sediment or rock samples, measure the concentration of chemical elements, and report these typically either in weight percent or in parts per million (ppm). There are usually a large number of elements measured and the distributions are often skewed, containing many potential outliers. We present a new robust principal component analysis (PCA) method for geochemical survey data, that involves first transforming the compositional data onto a manifold using a relative...[Show more]
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