R package episensr: Basic Sensitivity Analysis of Epidemiological Results. Basic sensitivity analysis of the observed relative risks adjusting for unmeasured confounding and misclassification of the exposure/outcome, or both. It follows the bias analysis methods and examples from the book by Lash T.L, Fox M.P, and Fink A.K. ”Applying Quantitative Bias Analysis to Epidemiologic Data”, (’Springer’, 2009).