ROOT: Rashomon Set of Optimal Trees

Implements a general framework for globally optimizing user-specified objective functionals over interpretable binary weight functions represented as sparse decision trees, called ROOT (Rashomon Set of Optimal Trees). It searches over candidate trees to construct a Rashomon set of near-optimal solutions and derives a summary tree highlighting stable patterns in the optimized weights. ROOT includes a built-in generalizability mode for identifying subgroups in trial settings for transportability analyses (Parikh et al. (2025) <doi:10.1080/01621459.2025.2495319>).

Version: 0.1.1
Depends: R (≥ 3.5)
Imports: MASS, rpart, gbm, stats, withr, rpart.plot
Suggests: mlbench, testthat (≥ 3.0.0), knitr, rmarkdown, ragg
Published: 2026-03-10
DOI: 10.32614/CRAN.package.ROOT (may not be active yet)
Author: Yiren Hou ORCID iD [aut] (Equal contribution), Peter Liu [aut, cre] (0009-0000-2691-5637, Equal contribution), Sean McGrath ORCID iD [aut], Harsh Parikh ORCID iD [aut]
Maintainer: Peter Liu <bliu68 at jh.edu>
BugReports: https://github.com/peterliu599/ROOT/issues
License: MIT + file LICENSE
URL: https://github.com/peterliu599/ROOT
NeedsCompilation: no
Materials: README, NEWS
CRAN checks: ROOT results

Documentation:

Reference manual: ROOT.html , ROOT.pdf
Vignettes: Generalizability Path Example: Characterizing Underrepresented Populations (source, R code)
Optimization Path Example: Portfolio Selection via Variance Minimization (source, R code)
Quickstart Guide to ROOT (source, R code)

Downloads:

Package source: ROOT_0.1.1.tar.gz
Windows binaries: r-devel: not available, r-release: not available, r-oldrel: not available
macOS binaries: r-release (arm64): not available, r-oldrel (arm64): not available, r-release (x86_64): not available, r-oldrel (x86_64): not available

Linking:

Please use the canonical form https://CRAN.R-project.org/package=ROOT to link to this page.