Exploratory data analysis: recent advances for the interpretation of geochemical data

Analysis and mapping of soil geochemical anomalies: Implications for bedrock mapping and gold exploration in Giyani area, South Africa

“…In order to detect outliers in this study, the mono-element data were subjected to box-and-whiskers plots (Tukey, 1977;Kürzl, 1988;Carranza 2009;and references therein) using STATISTICA 12 software. Outliers (in the transformed data) were excluded from PC analysis, but the scores of the excluded outlier samples were calculated using the factor loading matrix.…”

Pedogeochemical mapping of Cr, Ni, and Cu in soils of the Barcelona Province (Catalonia, Spain): Relationships with soil physico-chemical characteristics

“…We applied Exploratory Data Analysis (EDA) techniques to statistically describe the data (Tukey, 1977;Hoaglin et al, 1983;Kürzl, 1988;Reimann and Filzmoser, 2000;Bech et al, 2006). Furthermore, for each element, we present four different EDA graphs: a histogram, a box-plot, a onedimensional scattergram, and a cumulative probability plot (CDF diagram).…”

Exploratory Analysis of Sediment Geochemistry to Determine the Source and Dispersion of Ba, Fe, Mn, Pb and Cu and in Chihuahua, Northern Mexico

“…Exploratory data analysis (EDA) is a technique developed in the 1980s to improve the interpretation of geochemical data (Kürzl, 1988). EDA has since then been effectively utilizedto analyze large data sets of sediment/soil geochemistry, whichby nature hold a close dependency to geology and thus tend to be non-normally distributed.…”

“…EDA has since then been effectively utilizedto analyze large data sets of sediment/soil geochemistry, whichby nature hold a close dependency to geology and thus tend to be non-normally distributed. EDA overcomes the non-normality limitation by generating instead 'potentially explicable' data patterns (Kürzl, 1988;Zhang & Selinus, 1998;Carranza, 2009;Chiprés et al, 2009b). In addition, EDA permits the grouping of data with respect to parent material and/or soil type (Carranza, 2009;Chiprés et al, 2009a) and the analysis of only selected elements (Zhang & Selinus, 1998;Reimann & Garret, 2005;Carranza, 2009).…”

“…In addition, EDA permits the grouping of data with respect to parent material and/or soil type (Carranza, 2009;Chiprés et al, 2009a) and the analysis of only selected elements (Zhang & Selinus, 1998;Reimann & Garret, 2005;Carranza, 2009). Common techniques utilized in EDA include density trace, scatterplot and box-plot diagrams (Kürzl, 1988). BoxPlot, also called Tuckey or Whisker diagram, is shown schematically in Figure 3.…”