fourPNO: Bayesian 4 Parameter Item Response Model

Estimate Barton & Lord's (1981) <doi:10.1002/j.2333-8504.1981.tb01255.x> four parameter IRT model with lower and upper asymptotes using Bayesian formulation described by Culpepper (2016) <doi:10.1007/s11336-015-9477-6>.

Version: 1.0.4
Depends: R (≥ 3.0.2)
Imports: Rcpp (≥ 0.12.10)
LinkingTo: Rcpp (≥ 0.12.10), RcppArmadillo (≥ 0.7.800)
Published: 2017-04-26
Author: Steven Andrew Culpepper [aut, cre]
Maintainer: Steven Andrew Culpepper <sculpepp at>
License: GPL-2 | GPL-3 [expanded from: GPL (≥ 2)]
NeedsCompilation: yes
Citation: fourPNO citation info
Materials: README NEWS
In views: Psychometrics
CRAN checks: fourPNO results


Reference manual: fourPNO.pdf
Package source: fourPNO_1.0.4.tar.gz
Windows binaries: r-devel:, r-release:, r-oldrel:
OS X El Capitan binaries: r-release: fourPNO_1.0.4.tgz
OS X Mavericks binaries: r-oldrel: fourPNO_1.0.4.tgz
Old sources: fourPNO archive


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