State-Year Panel for Merging Correlates of War Data (Gleditsch-Ward)
gw_cw_panel.RdThis a state-year panel in which the Gleditsch-Ward state system is the population of interest. They are matched, as well as one can, with their corollaries in the Correlates of War system. Its primary use is merging in data demarcated in Correlates of War state system codes when the primary system in use is the Gleditsch-Ward system.
Format
A data frame with the following 6 variables.
stateabbthe state abbreviation, which was the greatest source of agreement between both data sets
yeara numeric vector for the year
gwcodea Gleditsch-Ward state code
ccodea Correlates of War state code
gw_statenamethe state name as it appears in the Gleditsch-Ward data.
cw_statenamethe state name as it appears in the Correlates of War data.
Details
The data-raw/ directory on Github contains more information about how
these data were created. The code itself is derived from what peacesciencer
did for its gw_cow_years data. It amounts to the creation of daily data for
both systems before doing a "full join" on where there is the least friction:
state abbreviations. This at least requires the least amount of clean-up.
Use of these data will merge only on the state code and year. The state abbreviations and state names are there for background information, where necessary/appropriate.
peacesciencer's documentation cautions that the differences between the two systems are obvious, if often overstated. Merging one into the other, where possible, will be unproblematic in almost all cases. The biggest headaches concern German unification, Yemeni unification, and the overall history of Serbia/Yugoslavia.
Examples
str(gw_cw_panel)
#> tibble [20,792 × 6] (S3: tbl_df/tbl/data.frame)
#> $ stateabb : chr [1:20792] "USA" "USA" "USA" "USA" ...
#> $ year : num [1:20792] 1816 1817 1818 1819 1820 ...
#> $ gwcode : num [1:20792] 2 2 2 2 2 2 2 2 2 2 ...
#> $ ccode : num [1:20792] 2 2 2 2 2 2 2 2 2 2 ...
#> $ gw_statename: chr [1:20792] "United States of America" "United States of America" "United States of America" "United States of America" ...
#> $ cw_statename: chr [1:20792] "United States of America" "United States of America" "United States of America" "United States of America" ...
head(gw_cw_panel)
#> # A tibble: 6 × 6
#> stateabb year gwcode ccode gw_statename cw_statename
#> <chr> <dbl> <dbl> <dbl> <chr> <chr>
#> 1 USA 1816 2 2 United States of America United States of America
#> 2 USA 1817 2 2 United States of America United States of America
#> 3 USA 1818 2 2 United States of America United States of America
#> 4 USA 1819 2 2 United States of America United States of America
#> 5 USA 1820 2 2 United States of America United States of America
#> 6 USA 1821 2 2 United States of America United States of America