Natural strata can be used in observational studies to balance the distributions of many covariates across any number of treatment groups and any number of comparisons. These strata have proportional amounts of units within each stratum across the treatments, allowing for simple interpretation and aggregation across strata. Within each stratum, the units are chosen using randomized rounding of a linear program that balances many covariates. For more details, see Brumberg et al. (2022) <doi:10.1111/rssa.12848> and Brumberg et al.(2023) <doi:10.1093/jrsssc/qlad010>. To solve the linear program, the 'Gurobi' commercial optimization software is recommended, but not required. The 'gurobi' R package can be installed by following the instructions at <https://docs.gurobi.com/projects/optimizer/en/current/reference/r/setup.html> after claiming your free academic license at <https://www.gurobi.com/academia/academic-program-and-licenses/>.
| Version: | 2.0.1 |
| Depends: | R (≥ 2.10), caret |
| Imports: | Rglpk, stats, plyr, pps, sampling, ggplot2, rlang, ramify, slam |
| Suggests: | knitr, rmarkdown, markdown, testthat (≥ 3.0.0), DT, stringr, covr, gurobi |
| Published: | 2026-02-03 |
| DOI: | 10.32614/CRAN.package.natstrat |
| Author: | Katherine Brumberg [aut, cre] |
| Maintainer: | Katherine Brumberg <kbrum at umich.edu> |
| BugReports: | https://github.com/kkbrum/natstrat/issues |
| License: | GPL-3 |
| URL: | https://github.com/kkbrum/natstrat, https://kkbrum.github.io/natstrat/, https://docs.gurobi.com/projects/optimizer/en/current/reference/r/setup.html |
| NeedsCompilation: | no |
| Citation: | natstrat citation info |
| Materials: | README, NEWS |
| CRAN checks: | natstrat results |
| Reference manual: | natstrat.html , natstrat.pdf |
| Vignettes: |
Introduction to natstrat (source, R code) |
| Package source: | natstrat_2.0.1.tar.gz |
| Windows binaries: | r-devel: natstrat_2.0.1.zip, r-release: natstrat_2.0.1.zip, r-oldrel: natstrat_2.0.1.zip |
| macOS binaries: | r-release (arm64): natstrat_2.0.1.tgz, r-oldrel (arm64): natstrat_2.0.1.tgz, r-release (x86_64): natstrat_2.0.1.tgz, r-oldrel (x86_64): natstrat_2.0.1.tgz |
| Old sources: | natstrat archive |
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