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Description: Natural strata can be used in observational studies to balance
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the distributions of many covariates across any number of treatment
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groups and any number of comparisons. These strata have proportional
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amounts of units within each stratum across the treatments, allowing
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for simple interpretation and aggregation across strata. Within each
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stratum, the units are chosen using randomized rounding of a linear
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program that balances many covariates. For more details, see Brumberg et al. (2022) <https://doi.org/10.1111/rssa.12848> and Brumberg et al.(2023) <https://doi.org/10.1093/jrsssc/qlad010>.
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To solve the linear program, the 'Gurobi' commercial optimization software
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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/>.
[](https://app.codecov.io/gh/kkbrum/natstrat?branch=master)
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Natural strata can be used in observational studies to balance
textVersion = paste("Brumberg, K. (2024). natstrat: Obtain Unweighted Natural Strata that Balance Many Covariates. R package version", packageVersion("natstrat"), ". https://github.com/kkbrum/natstrat")
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)
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bibentry(bibtype = "Article",
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title = "Using Randomized Rounding of Linear Programs to Obtain Unweighted Natural Strata that Balance Many Covariates",
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author = c(
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person("Katherine", "Brumberg"),
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person("Dylan", "S", "Small"),
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person("Paul", "R", "Rosenbaum")
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),
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journal = "Journal of the Royal Statistical Society Series A: Statistics in Society",
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year = 2022,
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volume = 185,
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number = 4,
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pages = "1931-1951",
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doi = "10.1111/rssa.12848",
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url = "https://doi.org/10.1111/rssa.12848",
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textVersion = "Brumberg, K., Small, D. S., & Rosenbaum, P. R. (2022). Using Randomized Rounding of Linear Programs to Obtain Unweighted Natural Strata that Balance Many Covariates. Journal of the Royal Statistical Society Series A: Statistics in Society, 185(4), 1931-1951. https://doi.org/10.1111/rssa.12848"
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)
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bibentry(bibtype = "Article",
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title = "Using natural strata when examining unmeasured biases in an observational study of neurological side effects of antibiotics",
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author = c(
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person("Katherine", "Brumberg"),
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person("Darcy", "E", "Ellis"),
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person("Dylan", "S", "Small"),
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person("Sean", "Hennessy"),
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person("Paul", "R", "Rosenbaum")
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),
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journal = "Journal of the Royal Statistical Society Series C: Applied Statistics",
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year = 2023,
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volume = 72,
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number = 2,
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pages = "314-329",
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doi = "10.1093/jrsssc/qlad010",
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url = "https://doi.org/10.1093/jrsssc/qlad010",
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textVersion = "Brumberg, K., Ellis, D. E., Small, D. S., Hennessy, S., & Rosenbaum, P. R. (2023). Using natural strata when examining unmeasured biases in an observational study of neurological side effects of antibiotics. Journal of the Royal Statistical Society Series C: Applied Statistics, 72(2), 314-329. https://doi.org/10.1093/jrsssc/qlad010"
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