This is a simple data set that communicates directed dyads in the
Gleditsch-Ward system that appear in the same year, but not in any particular
day in the year. They are used in an anti-join in the
create_dyadyears() function in this package.
Format
A data frame with the following six variables.
gwcode1a numeric vector for the Gleditsch-Ward state code for the first state
gwcode2a numeric vector for the Gleditsch-Ward state code for the second state
yeara numeric vector for the year
microstate1a numeric vector that equals 1 if the first state in the dyad is a micro-state. 0 if otherwise.
microstate2a numeric vector that equals 1 if the second state in the dyad is a micro-state. 0 if otherwise.
in_psa constant that equals 1 if these data would appear in
create_dyadyears()if you were not careful to remove them.
Details
Think of the directed Serbia and Yugoslavia dyad from 2006 as illustrative here. The Gleditsch-Ward system ends Yugoslavia June 4, 2006 and re-enters Serbia (its rump state) on June 5, 2006. How to treat Serbia/Yugoslavia is one of the clearest differences between the Correlates of War system and the Gleditsch-Ward system, and understanding how the Gleditsch-Ward system treats this case matters a great deal in creating dyad-year data. There should obviously be no Serbia-Yugoslavia dyad when Serbia is the rump state of Yugoslavia that Gleditsch-Ward re-enter into their system when Montenegro split from it and enters the state system on June 3, 2006. Both Serbia and Yugoslavia existed in 2006, but not on the same day in the same year.