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type: software
license: MIT
title: 'pecanr: Partial Eta-Squared for Crossed, Nested, and Mixed Linear Mixed Models'
version: 0.2.0
doi: 10.32614/CRAN.package.pecanr
abstract: Computes partial eta-squared effect sizes for fixed effects in linear mixed
  models fitted with the 'lme4' package. Supports crossed, nested, and mixed (crossed-and-nested)
  random effects structures with any number of grouping factors. Mixed designs handle
  cases where grouping factors are simultaneously crossed with some variables and
  nested within others (e.g., photos nested within models, but both crossed with participants).
  Random slope variances are translated to the outcome scale using a variance decomposition
  approach, correctly accounting for predictor scaling and interaction terms. Both
  general and operative effect sizes are provided. Methods are based on Correll, Mellinger,
  McClelland, and Judd (2020) <https://doi.org/10.1016/j.tics.2019.12.009>, Correll,
  Mellinger, and Pedersen (2022) <https://doi.org/10.3758/s13428-021-01687-2>, and
  Rights and Sterba (2019) <https://doi.org/10.1037/met0000184>.
authors:
- family-names: Cohen
  given-names: Brandon
  email: brandon.cohen-1@colorado.edu
  orcid: https://orcid.org/0009-0004-1802-3435
- family-names: Correll
  given-names: Joshua
  email: joshua.correll@colorado.edu
  orcid: https://orcid.org/0000-0003-1142-459X
repository: https://bcohen0901.r-universe.dev
repository-code: https://github.com/bcohen0901/pecanr
commit: 2c8906e0bb66edba5a471cae1f2f1653dfdadc7c
url: https://github.com/bcohen0901/pecanr
date-released: '2026-03-18'
contact:
- family-names: Cohen
  given-names: Brandon
  email: brandon.cohen-1@colorado.edu
  orcid: https://orcid.org/0009-0004-1802-3435