Record Linkage and Epidemiological Case Definitions in 'R' R package diyar version 0.5.1 CRAN Task View: Epidemiology (https://CRAN.R-project.org/view=Epidemiology) CRAN Task View: MissingData (https://CRAN.R-project.org/view=MissingData) An R package for iterative and batched record linkage, and applying epidemiological case definitions. 'diyar' can be used for deterministic and probabilistic record linkage, or multistage record linkage combining both approaches. It features the implementation of nested match criteria, and mechanisms to address missing data and conflicting matches during stepwise record linkage. Case definitions are implemented by assigning records to groups based on match criteria such as person or place, and overlapping time or duration of events e.g. sample collection dates or periods of hospital stays. Matching records are assigned a unique group ID. Index and duplicate records are removed or further analyses as required. Software Depends: R (>= 3.5.0) Imports: methods, utils, ggplot2, rlang Suggests: knitr, rmarkdown, testthat, covr Olisaeloka Nsonwu <olisa.nsonwu@gmail.com> Comprehensive R Archive Network (CRAN) Olisaeloka Nsonwu GPL-3 2023-11-12 application/tgz https://CRAN.R-project.org/package=diyar doi:10.32614/CRAN.package.diyar en-GB