Plackett-Luce Models for Rankings R package PlackettLuce version 0.4.5 Functions to prepare rankings data and fit the Plackett-Luce model jointly attributed to Plackett (1975) <doi:10.2307/2346567> and Luce (1959, ISBN:0486441369). The standard Plackett-Luce model is generalized to accommodate ties of any order in the ranking. Partial rankings, in which only a subset of items are ranked in each ranking, are also accommodated in the implementation. Disconnected/weakly connected networks implied by the rankings may be handled by adding pseudo-rankings with a hypothetical item. Optionally, a multivariate normal prior may be set on the log-worth parameters and ranker reliabilities may be incorporated as proposed by Raman and Joachims (2014) <doi:10.1145/2623330.2623654>. Maximum a posteriori estimation is used when priors are set. Methods are provided to estimate standard errors or quasi-standard errors for inference as well as to fit Plackett-Luce trees. See the package website or vignette for further details. Software Depends: R (>= 3.5) Imports: CVXR, igraph, Matrix, matrixStats, methods, partykit, psychotools, psychotree, R6, RSpectra, qvcalc, sandwich, stats Suggests: BayesMallows, BradleyTerry2, PLMIX, ROlogit, StatRank, bookdown, covr, hyper2, kableExtra, knitr, lbfgs, gnm, pmr, rmarkdown, survival, testthat Heather Turner <ht@heatherturner.net> Comprehensive R Archive Network (CRAN) Heather Turner [aut, cre] (ORCID: <https://orcid.org/0000-0002-1256-3375>), Ioannis Kosmidis [aut] (ORCID: <https://orcid.org/0000-0003-1556-0302>), David Firth [aut] (ORCID: <https://orcid.org/0000-0003-0302-2312>), Jacob van Etten [ctb] (ORCID: <https://orcid.org/0000-0001-7554-2558>) GPL-3 2026-03-25 application/tgz https://CRAN.R-project.org/package=PlackettLuce doi:10.32614/CRAN.package.PlackettLuce en-GB