add_ucdp_acd: Add UCDP Armed Conflict Data to state-year data frame
| add_ucdp_acd | R Documentation |
Add UCDP Armed Conflict Data to state-year data frame
Description
add_ucdp_acd() allows you to add UCDP Armed Conflict data
to a state-year data frame
Usage
add_ucdp_acd(data, type, issue, only_wars = FALSE)
Arguments
data |
state-year data frame |
type |
the types of armed conflicts the user wants to consider, specified
as a character vector. Options include "extrasystemic", "interstate",
"intrastate", and "II". "II" is convenience shorthand for "internationalized
intrastate". If you want just one (say: "intrastate"), then the type you want
in quotes is sufficient. If you want multiple, wrap it in a vector with
|
issue |
do you want to subset the data to just different armed conflicts
over different types of issues? If so, specify those here as you would with
the |
only_wars |
subsets the conflict data to just those with intensity levels of "war" (i.e. >1,000 deaths). Defaults to FALSE. |
Details
Right now, only state-year data are supported.
It's worth saying that "both" in the issue argument should not be
understood as equivalent to c("territory","government"). The former is
a kind of "AND" (in boolean speak) and is an explicit category in the data.
The latter is an "OR" (in boolean speak) and is in all likelihood what you
want if you are tempted to specify "both" in the issue argument.
Value
add_ucdp_acd() takes a state-year data frame and returns
state-year information from the UCDP Armed Conflict data set (v. 25.1). The
variables returned are whether there is an ongoing armed conflict in that
year, whether there was an armed conflict episode onset that year, what was
the maximum intensity observed that year (if an armed conflict was observed),
and a character vector of the associated conflict IDs that year.
Author(s)
Steven V. Miller
References
Gleditsch, Nils Petter; Peter Wallensteen, Mikael Eriksson, Margareta Sollenberg, and Havard Strand. 2002. "Armed Conflict 1946–2001: A New Dataset." Journal of Peace Research 39(5): 615–637.
Davies, Shawn, Therése PEttersson, Margareta Sollenberg, and Magnus Öberg. 2025. "Organized violence 1989–2024, and the challenges of identifying civilian victims." Journal of Peace Research 62(4): 1223–1240.
Examples
# just call `library(tidyverse)` at the top of the your script.
library(magrittr)
library(dplyr)
create_stateyears(system = "gw", subset_years = c(1946:2024)) %>%
add_ucdp_acd()
create_stateyears(system = "gw", subset_years = c(1946:2024)) %>%
add_ucdp_acd(type = 'intrastate', issue = 'government')
