Unified Scores, Reliabilities and Validities from Multiple Tests R package unifyR version 1.0.0 In diagnostic contexts, individuals are often assessed using multiple tests that measure the same latent variable (e.g., intelligence). These test scores are typically not exactly identical. Simple averaging neglects the correlation between tests and the reduced variance of their combination. The 'unifyR' package provides functions to compute statistically accurate unified scores, reliabilities and validities of multiple tests. The underlying algorithms build on and extend the method proposed by Evans (1996, <DOI:10.3758/BF03204767>) and have been validated through simulations. Software Depends: R (>= 4.2.0) Dominik Weber <dominik.weber@uni-saarland.de> Comprehensive R Archive Network (CRAN) Dominik Weber [aut, cre], Marco Koch [aut], Frank M. Spinath [aut], Nicolas Becker [aut] GPL-3 2025-07-02 application/tgz https://CRAN.R-project.org/package=unifyR doi:10.32614/CRAN.package.unifyR