cusp: Cusp-Catastrophe Model Fitting Using Maximum Likelihood

Cobb's maximum likelihood method for cusp-catastrophe modeling (Grasman, van der Maas, & Wagenmakers, 2009, JSS, 32:8; Cobb, L, 1981, Behavioral Science, 26:1, 75–78). Includes a cusp() function for model fitting, and several utility functions for plotting, and for comparing the model to linear regression and logistic curve models.

Version: 2.3.3
Imports: stats, graphics, grDevices, utils
Suggests: plot3D
Published: 2015-08-10
Author: Raoul P. P. P. Grasman [aut, cre, cph]
Maintainer: Raoul Grasman <rgrasman at>
BugReports: NA
License: GPL-2
NeedsCompilation: yes
Citation: cusp citation info
CRAN checks: cusp results


Reference manual: cusp.pdf
Vignettes: the cusp package
cusp package hands on tutorial examples
Package source: cusp_2.3.3.tar.gz
Windows binaries: r-devel:, r-release:, r-oldrel:
OS X Mavericks binaries: r-release: cusp_2.3.3.tgz, r-oldrel: cusp_2.3.3.tgz
Old sources: cusp archive