Linkage Using Diagnosis Codes

Probabilistic record linkage without direct identifiers using only diagnosis codes. Method is detailed in: Hejblum, Weber, Liao, Palmer, Churchill, Szolovits, Murphy, Kohane & Cai (2019) ; Zhang, Hejblum, Weber, Palmer, Churchill, Szolovits, Murphy, Liao, Kohane & Cai (2021) .

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ludic is a package which performs probabilistic record linkage methods that relies on the use of diagnosis codes only, in the absence of direct identifiers. On top of the CRAN help files, the following article explains what ludic is about:


The easiest way to get ludic is to install it from CRAN:


or alternatively you can get the development version from GitHub:


-- Boris Hejblum


News about the ludic R package

Main changes in Version 0.1.6 (2017-01-28):

  • RA data added

Main changes in Version 0.1.5 (2016-12-29) --- this is only a minor release:

  • CITATION infos added

Reference manual

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0.2.0 by Boris P Hejblum, 5 months ago

Report a bug at

Browse source code at

Authors: Boris P Hejblum [aut, cre] , Harrison G Zhang [aut] , Tianxi Cai [aut]

Documentation:   PDF Manual  

MIT + file LICENSE license

Imports fGarch, landpred, Matrix, methods, rootSolve

Depends on Rcpp

Suggests testthat

Linking to Rcpp, RcppArmadillo

See at CRAN