add_cow_mids: Add Correlates of War (CoW) Militarized Interstate Dispute...

View source: R/add_cow_mids.R

add_cow_midsR Documentation

Add Correlates of War (CoW) Militarized Interstate Dispute (MID) data to dyad-year data frame


add_cow_mids() merges in CoW's MID data to a dyad-year data frame. The version of the CoW-MID data in this package is version 5.0.


add_cow_mids(data, keep)



a dyad-year data frame (either "directed" or "non-directed")


an optional parameter, specified as a character vector, passed to the function in a select(one_of(.)) wrapper. This allows the user to discard unwanted columns from the directed dispute data so that the output does not consume too much space in memory. Note: the Correlates of War system codes (ccode1, ccode2), the observation year (year), the presence or absence of an ongoing MID (cowmidongoing), and the presence or absence of a unique MID onset (cowmidonset) are always returned. It would be foolish and self-defeating to eliminate those observations. The user is free to keep or discard anything else they see fit.

If keep is not specified in the function, the ensuing output returns everything.


Dyads are capable of having multiple disputes in a given year, which can create a problem for merging into a complete dyad-year data frame. Consider the case of France and Italy in 1860, which had three separate dispute onsets that year (MID#0112, MID#0113, MID#0306), as illustrative of the problem. This merging process employs several rules to whittle down these duplicate dyad-years for merging into a dyad-year data frame.

The function will also return a message to the user about the case-exclusion rules that went into this process. Users who are interested in implementing their own case-exclusion rules should look up the "whittle" class of functions also provided in this package.


add_cow_mids() takes a dyad-year data frame and adds dyad-year dispute information from the CoW-MID data.


Steven V. Miller


Palmer, Glenn, and Roseanne W. McManus and Vito D'Orazio and Michael R. Kenwick and Mikaela Karstens and Chase Bloch and Nick Dietrich and Kayla Kahn and Kellan Ritter and Michael J. Soules. 2021. "The MID5 Dataset, 2011–2014: Procedures, coding rules, and description" Conflict Management and Peace Science.


# just call `library(tidyverse)` at the top of the your script
cow_ddy %>% add_cow_mids()

# keep just the dispute number and Side A/B identifiers
cow_ddy %>% add_cow_mids(keep=c("dispnum","sidea1", "sidea2"))

peacesciencer documentation built on March 31, 2023, 8:37 p.m.