Tests for Instrumental Variable Validity R package ivcheck version 0.1.1 Implements tests for the identifying assumptions of instrumental variable models, the local exclusion restriction and monotonicity conditions required for local average treatment effect identification. Covers Kitagawa (2015) <doi:10.3982/ECTA11974>, Mourifie and Wan (2017) <doi:10.1162/REST_a_00622>, and Frandsen, Lefgren, and Leslie (2023) <doi:10.1257/aer.20201860>. Includes a one-shot wrapper that runs all applicable tests on a fitted instrumental variable model. Dispatches on 'fixest' and 'ivreg' model objects. Software Depends: R (>= 4.1.0) Imports: cli (>= 3.6.0), stats, parallel Suggests: testthat (>= 3.0.0), fixest, ivreg, modelsummary, broom, spelling, knitr, rmarkdown Charles Coverdale <charlesfcoverdale@gmail.com> Comprehensive R Archive Network (CRAN) Charles Coverdale [aut, cre] MIT + file LICENSE (https://CRAN.R-project.org/package=ivcheck/LICENSE) 2026-04-22 application/tgz https://CRAN.R-project.org/package=ivcheck doi:10.32614/CRAN.package.ivcheck en-US