A MULTIVARIATE OUTLIER DETECTION METHOD

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Rainbow Plots, Bagplots, and Boxplots for Functional Data (2010, methodology): “scaled the retained principal components, Filzmoser, Maronna, and Werner (2008) calculated the robust Mahalanobis distance for each curve.”
Evaluating the purchase behaviour of organic food by young consumers in an emerging market economy (2019, methodology): “Standardised values (z scores) were used to examine univariate outliers, whilst Mahalanobis distance was used to check multivariate outliers (Filzmoser, 2004).”