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Functions for working with two- and four-parameter Beta distributions and the closely related Beta-Binomial distribution, and for estimating the accuracy and consistency of test-based classifications. Includes d/p/q/r functions for four-parameter Beta distributions, including parameterization by mean and variance; d/p/r functions for Beta-Binomial distributions and for Lord's two-term approximation to the compound Binomial distribution; moments of Beta, Binomial, Beta-Binomial, and observed-score distributions; and method-of-moments fitting of two- and four-parameter Beta true-score distributions. Classification accuracy and consistency can be estimated with the 'Livingston and Lewis' approach (Livingston and Lewis, 1995 <doi:10.1111/j.1745-3984.1995.tb00462.x>), the 'Hanson and Brennan' approach based on Lord's strong true-score theory (Lord, 1965 <doi:10.1007/BF02289490>; Hanson, 1991 <https://files.eric.ed.gov/fulltext/ED344945.pdf>), and the multinomial and compound multinomial approach (Lee, 2007 <doi:10.1177/0146621606294206>; Lee, Brennan, and Wan, 2009 <doi:10.1177/0146621608321759>), for two or more categories, with ROC analysis, model-fit tests, and examinee- or score-level results.
| Version: | 2.0.0 |
| Imports: | graphics, stats |
| Suggests: | testthat (≥ 3.0.0) |
| Published: | 2026-10-19 |
| DOI: | 10.32614/CRAN.package.betafunctions |
| Author: | Haakon Eidem Haakstad [aut, cre] |
| Maintainer: | Haakon Eidem Haakstad <h.e.haakstad at gmail.com> |
| BugReports: | https://github.com/HaakonEidemHaakstad/betafunctions/issues |
| License: | CC0 |
| URL: | https://github.com/HaakonEidemHaakstad/betafunctions |
| NeedsCompilation: | no |
| Materials: | README, NEWS |
| In views: | Distributions, Psychometrics |
| CRAN checks: | betafunctions results |
| Reference manual: | betafunctions.html , betafunctions.pdf |
| Package source: | betafunctions_2.0.0.tar.gz |
| Windows binaries: | r-devel: betafunctions_2.0.0.zip, r-release: betafunctions_2.0.0.zip, r-oldrel: betafunctions_2.0.0.zip |
| macOS binaries: | r-release (arm64): betafunctions_2.0.0.tgz, r-oldrel (arm64): betafunctions_2.0.0.tgz, r-release (x86_64): betafunctions_2.0.0.tgz, r-oldrel (x86_64): betafunctions_2.0.0.tgz |
| Old sources: | betafunctions archive |
| Reverse imports: | IRTest |
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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.