These are the Correlates of War state system membership data.
Format
A data frame with 243 observations on the following 10 variables.
stateabb
a character vector for the state abbreviation
ccode
a numeric vector for the Correlates of War country code
statenme
a character vector for the state name
styear
the start year in the system
stmonth
the start month in the system
stday
the start day in the system
endyear
the end year in the system
endmonth
the end month in the system
endday
the end day in the system
version
a version identifier
Details
Data are provided "as-is" with no additional re-cleaning before inclusion into this data set.
References
Correlates of War Project. 2017. "State System Membership List, v2016." Online, https://correlatesofwar.org/data-sets/state-system-membership/