This is a complete directed dyad-year data frame of Gleditsch-Ward state system members. I offer it here as a shortcut for various other functions. As a general rule, this data frame is updated after every calendar year to include the most recently concluded calendar year.
Format
A data frame with the following 5 variables.
gwcode1
a numeric vector for the Correlates of War state code for the first state
gwcode2
a numeric vector for the Correlates of War state code for the second state
year
a numeric vector for the year
microstate1
a numeric vector that equals 1 if the first state in the dyad is a micro-state. 0 if otherwise.
microstate2
a numeric vector that equals 1 if the second state in the dyad is a micro-state. 0 if otherwise.