From Posit's CRAN Mirror http://cran-logs.rstudio.com/
cranDistribution(package = NULL, date = NULL, all.filters = FALSE,
ip.filter = FALSE, small.filter = FALSE, memoization = TRUE,
check.package = TRUE, multi.core = FALSE)An R data frame.
Character. Vector of package name(s). NULL for all downloads, all of CRAN
Character. Date. "yyyy-mm-dd". NULL uses latest available log.
Logical. Master switch for filters.
Logical.
Logical. TRUE filters out downloads less than 1000 bytes.
Logical. Use memoization when downloading logs.
Logical. Validate and "spell check" package.
Logical or Numeric. TRUE uses parallel::detectCores(). FALSE uses one, single core. You can also specify the number logical cores. Mac and Unix only.