ultiple times. Because variables need to be uniquely named internally, multiply selected variables will be included in the plot with a suffix of &lt;.number&gt;, familiar from how multiple occurrences of the same variable names are resolved in data frames. The order in which variables are selected determines the order in which the corresponding axis is drawn in the parallel coordinate plots. <code>pcp_select</code> transforms the selected variables to long form and</p>
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