Hadley Wickham

Greater Houston Contact Info
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Experienced Chief Scientist with a demonstrated history of working in the computer…

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  • Posit PBC

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Publications

  • The Generalized Pairs Plot

    Journal of Computational and Graphical Statistics

    This paper develops a generalization of the scatterplot matrix based on the recognition that most data sets include both categorical and quantitative information. Traditional grids of scatterplots often obscure important features of the data when one or more variables are categorical but coded as numerical. The generalized pairs plot offers a range of displays of paired combinations of categorical and quantitative variables. A mosaic plot, fluctuation diagram, or facetted bar chart may be used…

    This paper develops a generalization of the scatterplot matrix based on the recognition that most data sets include both categorical and quantitative information. Traditional grids of scatterplots often obscure important features of the data when one or more variables are categorical but coded as numerical. The generalized pairs plot offers a range of displays of paired combinations of categorical and quantitative variables. A mosaic plot, fluctuation diagram, or facetted bar chart may be used to display two categorical variables. A side-by-side boxplot, stripplot, facetted histogram, or density plot helps visualize a categorical and a quantitative variable. A traditional scatterplot is suitable for displaying a pair of numerical variables, but options also support density contours or annotating summary statistics such as the correlation and number of missing values, for example. Two different packages provide implementations of the generalized pairs plot, gpairs and GGally. The use of the generalized pairs plot may reveal structure in multivariate data which otherwise might go unnoticed in
    the process of exploratory data analysis.

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