RESI
Robust Effect Size Index (RESI) Estimation
Summarize model output using a robust effect size index. The index is introduced in Vandekar, Tao, & Blume (2020,
RESI 
RESI is an R package designed to implement the Robust Effect Size Index
(RESI, denoted as S) described in Vandekar, Tao, & Blume (2020). The
RESI is a versatile effect size measure that can be easily computed and
added to common reports (such as summary and ANOVA tables). This package
currently supports lm, glm, nls,
survreg, coxph, hurdle,
zeroinfl, gee, geeglm,
lme, lmerMod, lmrob, and
glmrob models. Confidence intervals are now computed using
the bootstrap or one of three asymptotic methods: a profiled quadratic
form, Cornish-Fisher expansion, or normal approximation. A Bayesian
bootstrap is also available for lm and nls
models. In addition to the main resi function, the package
also includes a point-estimate-only function (resi_pe),
conversions from S to other common effect size measures and vice versa,
print methods, plot methods, summary methods, and Anova/anova methods.
If you would like to contribute to the package, please branch off of our GitHub and submit a pull request describing the contribution. Please use the GitHub Issues page to report any problems and the Discussions page to seek additional support.
References
Jones M, Kang K, Vandekar S (2025). RESI: An R Package for Robust Effect Sizes. Journal of Statistical Software, 112(3), 1–27. https://doi.org/10.18637/jss.v112.i03.
Kang K, Jones MT, Armstrong K, Avery S, McHugo M, Heckers S, & Vandekar S. Accurate Confidence and Bayesian Interval Estimation for Non-centrality Parameters and Effect Size Indices. Psychometrika. 2023. https://doi.org/10.1007/s11336-022-09899-x.
Kang K, Seidlitz J, Bethlehem RAI, et al. Study design features increase replicability in brain-wide association studies. Nature. 2024. https://doi.org/10.1038/s41586-024-08260-9.
Vandekar S, Tao R, Blume J. A Robust Effect Size Index. Psychometrika. 2020;85(1):232–246. https://doi.org/10.1007/s11336-020-09698-2.
Zhang X, Muscatello R, Jones M, Corbett B, Vandekar S. Asymptotic Distribution of Robust Effect Size Index. arXiv:2601.19004. 2026. https://doi.org/10.48550/arXiv.2601.19004.