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#' wars
#'
#' @description Data for Chinese wars example, see page 163
#'
#' The variables included in the dataset are:
#' \itemize{
#' \item\code{ONSET} ratio-level variable measuring the epochal (whether historical or calendar) time of event occurrence, measured in calendar year
#' \item\code{TERM} ratio-level variable measuring the epochal (historical) time of event conclusion, measured in calendar year
#' \item\code{EXTENT} number of belligerents involved on all sides of the war
#' \item\code{ETHNIC} intra-group or inter-group conflict
#' \item\code{DIVERSE} number of ethnic groups participating as belligerents
#' \item\code{ALLIANCE} total number of alliances among belligerents
#' \item\code{DYADS} number of alliance pairs
#' \item\code{POL.LEV} nominal-level variable measuring the political level of belligerent involvement regarding domestic and foreign belligerents, with a 1 for internal war, 2 for interstate war
#' \item\code{COMPLEX} governmental level of the warring parties, where the first variable is multiplied by ten for scale purposes
#' \item\code{POLAR} number of relatively major or great powers at the time of onset
#' \item\code{BALANCE} the difference in military capabilities: minor-minor, minor-major, major-major
#' \item\code{TEMPOR} type of war: protracted rivalry, integrative conquest, disintegrative/fracturing conflict, sporadic event
#' \item\code{SCOPE} political scope of conflicts in terms of governmental units affected
#' \item\code{DURATION} duration of conflict, measured in years
#' }
#'
#' @usage data(wars)
#' @name wars
#' @format a data frame of 104 observations of different China wars with 15 explanatory variables
#' @source Cioffi-Revilla, C. and Lai, D. (1995). War and Politics in Ancient China, 2700 B.C. to 722 B.C.: Measurement and Comparative Analysis. Journal of Conflict Resolution 39, 467-494.
#' @docType data
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