From RStudio's CRAN Mirror http://cran-logs.rstudio.com/
countryPackage(country = "HK", date = NULL, all.filters = FALSE,
ip.filter = FALSE, small.filter = FALSE, sequence.filter = FALSE,
size.filter = FALSE, sort.count = TRUE, memoization = TRUE)
Character. country abbreviation.
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. Set to FALSE.
Logical. Set to FALSE.
Logical. Sort by download count.
Logical. Use memoization when downloading logs.