#' Country Code Translation Data Frame
#'
#' A data frame with 262 observations on the following 15 variables.
#' Used internally by the \code{countrycode()} function.
#'
#' \itemize{
#' \item country.name: Long country name
#' \item cowc: Correlates of War character
#' \item cown: Correlates of War numeric
#' \item fao: Food and Agriculture Organization of the United Nations numerical code
#' \item fips104: FIPS 10-4 (Federal Information Processing Standard)
#' \item imf: International Monetary Fund
#' \item iso2c: ISO-2 character
#' \item iso3c: ISO-3 character
#' \item iso2n: ISO-2 numeric
#' \item iso3n: ISO-3 numeric
#' \item un: United Nations numerical code
#' \item wb: World Bank (very similar but not identical to iso3c)
#' \item ioc: International Olympic Committee
#' \item regex: Regular expression used to convert long names to code
#' \item region: Regions as defined in the World Bank Development Indicators
#' \item continent: Continent as defined in the World Bank Development Indicators
#'
#' }
#'
#' @note To produce consistent conversion, some entries had to be removed from the
#' conversion data frame. For example, the Correlates of War include 4 different
#' codes to represent Western Germany. "countrycode" uses only one of them (CoW
#' code 260 for all years). Similar choices were made in the cases of Korea,
#' Yemen, Congo and Vietnam. Also, Namibia's iso2c code ("NA") can be understood
#' as a missing observation (NA) by R.
#'
#' Capitalized country names refer to the official short English names, as defined
#' by the ISO organization. ISO does not publish official short English names for
#' countries whose name is not capitalized in the the country.name vector. Continent
#' and region information was taken from the UN website.
#'
#' This is a (possibly incomplete) list of countries and codes that were dropped:
#'
#' KOREA, REPUBLIC OF: cown 731 730, cowc PRK KOR
#' YEMEN: cown 680 678, cowc YAR YPR
#' GERMANY: cown 267 260 245, cowc BAV GFR BAD
#' CONGO: cown 490, cowc 484
#' VIET NAM: cown 816, cowc DRV
#' @docType data
#' @keywords datasets
#' @name countrycode_data
#' @usage countrycode_data
#' @format A data frame with 260 rows and 11 columns
NULL
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