Santi, Flavio, Maria Michela Dickson, Giuseppe Espa, and Diego Giuliani. “plot3logit: Ternary Plots for Interpreting Trinomial Regression Models”. Journal of Statistical Software, Code Snippets 103, no. 1 (July 19, 2022): 1–27. Accessed April 23, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v103c01.