isop-package {ISOP}R Documentation

An implementation of the ISOP model proposed by Scheiblechner (see references)


Package: isop
Type: Package
Version: 1.0
Date: 2008-10-23
License: GPLv2
LazyLoad: yes

First test if model fits using isop.calc1set and isop.calc2set. If it fits, use isop.sysch, isop.plot3d and isop.plotFreqs, to determine the characteristics of the data.


Stefan Nachtnebel


Hartmann Scheiblechner (2003) Nonparametric IRT: Testing the bi-isotonicity of isotonic probabilistic models (ISOP) Psychometrika, 68, 1, 79–96

[Package ISOP version 1.0 Index]