From RStudio's CRAN Mirror http://cran-logs.rstudio.com/
countryPackage(country = "HK", date = NULL, all.filters = FALSE,
ip.filter = FALSE, sequence.filter = FALSE, size.filter = FALSE,
small.filter = FALSE, version.filter = FALSE, sort.count = TRUE,
memoization = TRUE, multi.core = FALSE)Character. country abbreviation.
Character. Date. "yyyy-mm-dd". NULL uses latest available log.
Logical. Master switch for filters.
Logical.
Logical.
Logical.
Logical. TRUE filters out downloads less than 1000 bytes.
Logical. TRUE selects only most recent version.
Logical. Sort by download count.
Logical. Use memoization when downloading logs.
Logical or Numeric. TRUE uses parallel::detectCores(). FALSE uses one, single core. You can also specify the number logical cores.