MBESS 5.0.0 (2026)

Maintenance release. MBESS is mature, stable, and widely used, and it remains fully supported. Maintenance mode does not mean the package is finished or abandoned: MBESS will continue to be maintained so that it keeps working with current versions of R and its dependencies, and it will remain on CRAN. New methodological development now takes place in the successor package, DMAR (Design, Measurement, and Analysis in R), which is available on CRAN. MBESS and DMAR are designed to coexist; existing code that relies on MBESS will keep working, so there is no need to migrate.

• Documentation and references brought up to date. Citations that had previously appeared as “submitted”, “in press”, or “under review” now cite the published articles (for example, Kelley, 2008; Kelley & Lai, 2011; Lai & Kelley, 2012; Chattopadhyay & Kelley, 2016, 2017; Lachowicz, Preacher, & Kelley, 2018; Li, McLouth, & Delaney, 2020).
• Numerous spelling and typographical corrections throughout the help pages.
• ci.reliability(): fixed a misnamed variable that caused the lower/upper logit confidence limit swap to be skipped in an edge case.
• Internal calls into Suggested packages were brought up to their current, fully namespaced forms. ss.aipe.rmsea.sensitivity() now calls sem::sem() directly, so it no longer fails when the sem package is installed but not attached. ci.reliability() now uses lavaan::lavInspect() in place of the older lavaan::inspect(), with identical numerical results.
• Added an inst/CITATION file, this NEWS file, and an expanded README.
• Contributor acknowledgments now ship with the package (see the CONTRIBUTORS file in the installed package) rather than depending on an external web page.

MBESS 4.0.0 (2016)

Major release.

MBESS 3.0.0 (2010)

Major release. Versions 3.0.0 through 3.3.3 included Keke (Brian) Lai as coauthor and maintainer. Lai, Ken Kelley’s doctoral advisee at Indiana University and the University of Notre Dame, has since stepped away from package maintenance and development, but his contributions to individual functions remain and he is credited as their coauthor.

MBESS 2.0.0 (2008)

Major release.

MBESS 1.0.0 (2007)

Major release.

MBESS 0.0.1 (2006-05-06)

First public release.