This post is a synopsis of  Pfadt, J. M., van den Bergh, D., Sijtsma, K., Moshagen, M., & Wagenmakers, E.-J. (in press). Bayesian estimation of single-test reliability coefficients. Multivariate Behavioral Research. Preprint available at https://psyarxiv.com/exg2y   Abstract Popular measures of reliability for a single-test administration include coefficient α, coefficient λ2, the greatest lower bound (glb), …