Access CDC Behavioral Risk Factor Surveillance System Data R package brfssdata version 0.1.0 Download, cache, and analyze annual microdata from the United States Centers for Disease Control and Prevention Behavioral Risk Factor Surveillance System (BRFSS) <https://www.cdc.gov/brfss/>. Each requested survey year is downloaded once as a compact file hosted on public releases, verified against a published checksum, and cached locally; queries then run through 'DuckDB' (via the 'duckdb' package), so column selection and repeat analyses never re-transfer data. Survey-design helpers construct 'srvyr' design objects with year-appropriate weights, strata, and primary sampling units, including explicit handling of the 2011 weighting methodology change and of the codes CDC uses for missing-type answers. Software Depends: R (>= 4.2) Imports: cli, DBI, duckdb (>= 1.5.5), jsonlite, rlang, srvyr (>= 1.0.0), tibble, tools, utils Suggests: curl, dplyr, knitr, rmarkdown, spelling, survey, testthat, withr Muntasir Masum <muntasir.1124@gmail.com> Comprehensive R Archive Network (CRAN) Muntasir Masum [aut, cre, cph] (ORCID: <https://orcid.org/0000-0002-4210-2844>) MIT + file LICENSE (https://CRAN.R-project.org/package=brfssdata/LICENSE) 2026-08-21 application/tgz https://CRAN.R-project.org/package=brfssdata doi:10.32614/CRAN.package.brfssdata en-US