intraclass: Modern Intraclass Correlation Coefficients
Estimates interrater-reliability intraclass correlation coefficients (ICCs) within the generalizability-theory framework using modern variance-component estimation (linear mixed models) rather than the classical analysis-of-variance mean-squares approach. Provides the full ICC family (absolute agreement versus consistency, single versus average, fixed versus random raters, one-way versus two-way) with boundary-aware Monte-Carlo confidence intervals, support for imbalanced, incomplete, and multilevel (nested) designs, decision-study projection to other numbers of raters, and an interactive helper for choosing the correct coefficient. Multilevel methods follow ten Hove, Jorgensen and van der Ark (2022) <doi:10.1037/met0000391>.
| Version: | 0.1.0 |
| Depends: | R (≥ 4.5.0) |
| Imports: | cli, generics, glmmTMB, lifecycle, rlang, stats, tibble |
| Suggests: | brms, coda, covr, ggplot2, irr, irrICC, knitr, lavaan, lme4, merDeriv, posterior, psych, rmarkdown, spelling, testthat (≥ 3.0.0), withr |
| Published: | 2026-09-10 |
| DOI: | 10.32614/CRAN.package.intraclass |
| Author: | Jeffrey Girard 
[aut, cre] |
| Maintainer: | Jeffrey Girard <me at jmgirard.com> |
| BugReports: | https://github.com/jmgirard/intraclass/issues |
| License: | MIT + file LICENSE |
| URL: | https://github.com/jmgirard/intraclass, https://jmgirard.github.io/intraclass/ |
| NeedsCompilation: | no |
| Language: | en-US |
| Materials: | README, NEWS |
| CRAN checks: | intraclass results |
Documentation:
| Reference manual: | intraclass.html , intraclass.pdf |
| Vignettes: |
Choosing an ICC (source, R code) Comparison with other packages (source, R code) D-studies and within-cell replicates (source, R code) Estimation engines (source, R code) Getting started (source, R code) Glossary (source, R code) Confidence-interval methods (source, R code) Multilevel designs: subject and cluster level (source, R code) |
Downloads:
| Package source: | intraclass_0.1.0.tar.gz |
| Windows binaries: | r-devel: intraclass_0.1.0.zip, r-release: not available, r-oldrel: intraclass_0.1.0.zip |
| macOS binaries: | r-release (arm64): not available, r-oldrel (arm64): intraclass_0.1.0.tgz, r-release (x86_64): intraclass_0.1.0.tgz, r-oldrel (x86_64): intraclass_0.1.0.tgz |
Linking:
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