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<p>Using base plots the main function for drawing parallel coordinate plots is <code>parcoord</code> implemented in MASS (Venables and Ripley 2004). The package <code>gclus</code> (Hurley 2019) implements <code>cparcoord</code> to include panel color as a representation of the strength of a correlation between neighboring axes.</p>
<p>Within the ggplot2 environment there are several packages implementing parallel coordinate plots. For numeric variables there’s the function <code>ggparcoord</code> from t