Create a Panel of State-Years from the Correlates of War or Gleditsch-Ward system.

state_panel() is a function to create a panel of state-years from one of two major state systems in international relations scholarship.

Usage

state_panel(system = "cow", mry = TRUE)

Arguments

system

a state system (either "cow" or "gw")

mry

logical, defaults to TRUE. If TRUE, the panel created extends to the most recently concluded calendar year. If FALSE, the panel created ends at the year of last update. See details section for more.

Value

state_panel() returns a data frame of state years corresponding with either the Correlates of War or the Gleditsch-Ward system.

Details

This function leans on cw_system and gw_system in this package.

The Correlates of War system's last year is 2016. The Gleditsch-Ward system's last year is 2020. This information matters for the mry argument in the function.

Examples

head(state_panel(), 10)
#>    ccode                  cw_name year
#> 1      2 United States of America 1816
#> 2      2 United States of America 1817
#> 3      2 United States of America 1818
#> 4      2 United States of America 1819
#> 5      2 United States of America 1820
#> 6      2 United States of America 1821
#> 7      2 United States of America 1822
#> 8      2 United States of America 1823
#> 9      2 United States of America 1824
#> 10     2 United States of America 1825
head(state_panel(system='gw'), 10)
#>    gwcode                  gw_name year
#> 1       2 United States of America 1816
#> 2       2 United States of America 1817
#> 3       2 United States of America 1818
#> 4       2 United States of America 1819
#> 5       2 United States of America 1820
#> 6       2 United States of America 1821
#> 7       2 United States of America 1822
#> 8       2 United States of America 1823
#> 9       2 United States of America 1824
#> 10      2 United States of America 1825