add_archigos() allows you to add some information about leaders to dyad-year
or state-year data. The function leans on an abbreviated version of the data, which also comes in this package.
a dyad-year data frame (either "directed" or "non-directed") or state-year data frame
The function leans on attributes of the data that are provided by the
create_stateyear() function. Make sure that function (or data created by that function) appear at the top
of the proverbial pipe.
add_archigos() takes a dyad-year or state-year data frame and adds a few summary
variables based off the leader-level data. These include whether there was a leader transition in the
state-year (or first/second state in the dyad-year), whether there was an "irregular" leader transition,
the number of leaders in the state-year, the unique leader ID for Jan. 1 of the year, and the unique leader
ID for Dec. 31 of the year.
Steven V. Miller
Goemans, Henk E., Kristian Skrede Gleditsch, and Giacomo Chiozza. 2009. "Introducing Archigos: A Dataset of Political Leaders" Journal of Peace Research 46(2): 269–83.
# just call `library(tidyverse)` at the top of the your script library(magrittr) cow_ddy %>% add_archigos() create_stateyears() %>% add_archigos()
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