Collection of Correlation, Agreement, and Reliability Estimators R package matrixCorr version 0.12.2 Compute correlation, association, agreement, and reliability measures for small to high-dimensional datasets through a consistent matrix-oriented interface. Supports classical correlations (Pearson, Spearman, Kendall, Chatterjee's rank correlation), distance correlation, partial correlation with regularised estimators, shrinkage correlation for p >= n settings, robust correlations including biweight mid-correlation, percentage-bend, Winsorized, and skipped correlation, latent-variable methods for binary and ordinal data, pairwise and overall intraclass correlation for wide data, repeated-measures correlation, and agreement/reliability analyses based on Cohen's kappa, weighted kappa, multi-rater kappa, Gwet's AC1/AC2, Krippendorff's alpha, Bland-Altman methods, Lin's concordance correlation coefficient, Poisson GLMM concordance for count data, and repeated-measures intraclass/concordance correlation. Implemented with optimized C++ backends using BLAS/OpenMP and memory-aware symmetric updates, and returns standard R objects with print/summary/plot methods plus optional Shiny viewers for matrix inspection. Methods based on Ledoit and Wolf (2004) <doi:10.1016/S0047-259X(03)00096-4>; high-dimensional shrinkage covariance estimation <doi:10.2202/1544-6115.1175>; Lin (1989) <doi:10.2307/2532051>; Wilcox (1994) <doi:10.1007/BF02294395>; Wilcox (2004) <doi:10.1080/0266476032000148821>; Hayes and Krippendorff (2007) <doi:10.1080/19312450709336664>; weighted repeated-measures correlation by Kondo et al. (2025) <doi:10.1002/sim.70046>. Software Depends: R (>= 4.4.0) Imports: Rcpp (>= 1.1.0), ggplot2 (>= 3.5.2), Matrix (>= 1.7.2), cli, generics, rlang LinkingTo: Rcpp, RcppArmadillo Suggests: knitr, rmarkdown, MASS, mnormt, shiny, shinyWidgets, viridisLite, testthat (>= 3.0.0) Enhances: plotly Thiago de Paula Oliveira <thiago.paula.oliveira@gmail.com> Comprehensive R Archive Network (CRAN) Thiago de Paula Oliveira [aut, cre] (ORCID: <https://orcid.org/0000-0002-4555-2584>) GPL (>= 3) 2026-05-31 application/tgz https://CRAN.R-project.org/package=matrixCorr doi:10.32614/CRAN.package.matrixCorr