Gleditsch-Ward (Independent States) System Membership Data (1816-2017)Source:
These are the independent states in Gleditsch and Ward's data.
A data frame with 216 observations on the following 5 variables.
a numeric vector for the Gleditsch-Ward country code
a character vector for state abbreviation
a character vector for the state name
the start date in the data
the end date in the data
Data originally provided by Gleditsch with no column names. Column names
were added before some light re-cleaning in order to generate these data.
"Wuerttemberg" and "Cote D'Ivoire" in the
statename column needed to be
renamed to ensure maximal compliance with CRAN, which raises notes for
every non-ASCII character that appears in its package. I do not think this
to be problematic at all and, after all, state names should never be
a basis for something like a match or merge you would do in