Bayesian Reliability Estimation R package Bayesrel version 0.7.8 Functionality for reliability estimates. For 'unidimensional' tests: Coefficient alpha, 'Guttman's' lambda-2/-4/-6, the Greatest lower bound and coefficient omega_u ('unidimensional') in a Bayesian and a frequentist version. For multidimensional tests: omega_t (total) and omega_h (hierarchical). The results include confidence and credible intervals, the probability of a coefficient being larger than a cutoff, and a check for the factor models, necessary for the omega coefficients. The method for the Bayesian 'unidimensional' estimates, except for omega_u, is sampling from the posterior inverse 'Wishart' for the covariance matrix based measures (see 'Murphy', 2007, <https://groups.seas.harvard.edu/courses/cs281/papers/murphy-2007.pdf>. The Bayesian omegas (u, t, and h) are obtained by 'Gibbs' sampling from the conditional posterior distributions of (1) the single factor model, (2) the second-order factor model, (3) the bi-factor model, (4) the correlated factor model ('Lee', 2007, <doi:10.1002/9780470024737>). Software Depends: R (>= 2.10) Imports: LaplacesDemon, MASS, lavaan, coda, methods, stats, graphics, Rdpack, Rcpp (>= 1.0.4.6), psych LinkingTo: Rcpp, RcppArmadillo Suggests: knitr, rmarkdown, tinytest Julius M. Pfadt <julius.pfadt@gmail.com> Comprehensive R Archive Network (CRAN) Julius M. Pfadt [aut, cre] (ORCID: <https://orcid.org/0000-0002-0758-5502>), Don van den Bergh [aut] (ORCID: <https://orcid.org/0000-0002-9838-7308>), Joris Goosen [aut] GPL-3 2025-03-24 application/tgz https://CRAN.R-project.org/package=Bayesrel doi:10.32614/CRAN.package.Bayesrel