Fox J, Hong J. Effect Displays in R for Multinomial and Proportional-Odds Logit Models: Extensions to the effects Package. J. Stat. Soft. [Internet]. 2009 Oct. 14 [cited 2024 Nov. 21];32(1):1-24. Available from: https://www.jstatsoft.org/index.php/jss/article/view/v032i01