Factor analysis applied to regional geochemical data: problems and possibilities

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Multivariate outlier detection in exploration geochemistry (2005, background): “…many other multivariate methods) is based on the covariance matrix, a robust estimation of the covariance matrix will reduce the effect of (multivariate) outlying observations (Chork and Salminen, 1993; Reimann et al., 2002) and lead to a data interpretation centred on the dominant process(es).”