Ternary plots display three proportions which must sum to 1. It uses a triangular plotting area where each corner of the triangle represents an extreme with a single proportion equaling one with the other two proportions equaling zero. The center of the triangle represents the proportions 1/3, 1/3, 1/3. The ggtern package uses the ggplot2 graphics system to draw ternary plots.
Nicholas E. Hamilton, Michael Ferry (2018). ggtern: Ternary Diagrams Using ggplot2. Journal of Statistical Software, Code Snippets, 87(3), 1–17. DOI: 10.18637/jss.v087.c03.
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