Grasman R, van der Maas HL, Wagenmakers E-J. Fitting the Cusp Catastrophe in R: A cusp Package Primer. J. Stat. Soft. [Internet]. 2009 Nov. 9 [cited 2024 Apr. 18];32(8):1-27. Available from: https://www.jstatsoft.org/index.php/jss/article/view/v032i08