Alluvial plots use x-splines, sometimes augmented with stacked histograms, to visualize multi-dimensional or repeated-measures data with categorical or ordinal variables. They can be viewed as simplified and standardized Sankey diagrams; see Riehmann, Hanfler, and Froehlich (2005) <doi:10.1109/INFVIS.2005.1532152> and Rosvall and Bergstrom (2010) <doi:10.1371/journal.pone.0008694>. This package provides ggplot2 layers to produce alluvial plots from tidy data.
Many users identified problems and suggested improvements via email and the GitHub issue tracker.
Development benefitted from the use of equipment and the support of colleagues at UConn Health.
Useful links: