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D3mirt: Descriptive 3D Multidimensional Item Response Theory Modeling

For identifying, estimating, and plotting descriptive multidimensional item response theory models, restricted to 3D and dichotomous or polytomous data that fit the two-parameter logistic model or the graded response model. The method is primarily exploratory and centered on the plot function, which exposes item characteristics and constructs, represented by vector arrows, within a three-dimensional interactive latent space. The results can be useful for item-level analysis as well as test development.

Version: 2.0.5
Depends: R (≥ 3.6.0)
Imports: mirt, rgl (≥ 1.3.1)
Suggests: knitr, rmarkdown, stats, testthat, R.rsp
Published: 2026-06-07
DOI: 10.32614/CRAN.package.D3mirt
Author: Erik Forsberg ORCID iD [aut, cre, cph]
Maintainer: Erik Forsberg <forsbergpsychometrics at gmail.com>
BugReports: https://github.com/ForsbergPyschometrics/D3mirt/issues
License: GPL (≥ 3)
URL: https://github.com/ForsbergPyschometrics/D3mirt
NeedsCompilation: no
Citation: D3mirt citation info
Materials: README, NEWS
In views: Psychometrics
CRAN checks: D3mirt results

Documentation:

Reference manual: D3mirt.html , D3mirt.pdf
Vignettes: Introduction to D3mirt (source)

Downloads:

Package source: D3mirt_2.0.5.tar.gz
Windows binaries: r-devel: D3mirt_2.0.5.zip, r-release: D3mirt_2.0.5.zip, r-oldrel: D3mirt_2.0.5.zip
macOS binaries: r-release (arm64): D3mirt_2.0.5.tgz, r-oldrel (arm64): D3mirt_2.0.5.tgz, r-release (x86_64): D3mirt_2.0.5.tgz, r-oldrel (x86_64): D3mirt_2.0.5.tgz
Old sources: D3mirt archive

Linking:

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These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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