add_nmc: Add Correlates of War National Military Capabilities Data

View source: R/add_nmc.R

add_nmcR Documentation

Add Correlates of War National Military Capabilities Data


add_nmc() allows you to add the Correlates of War National Material Capabilities data to your data.





a data frame with appropriate peacesciencer attributes


Be mindful that the data are fundamentally state-year and that extensions to leader-level data should be understood as approximations for leaders in a given state-year.


add_nmc() takes a (dyad-year, leader-year, leader-dyad-year, state-year) data frame and adds information about the national material capabilities for the state or two states in the dyad in a given year. If the data are dyad-year (or leader-dyad-year), the function adds 12 total columns for the first state (i.e. ccode1) and the second state (i.e. ccode2) for all estimates of national military capabilities provided by the Correlates of War project. If the data are state-year (or leader-year), the function returns six additional columns to the original data that contain that same information for a given state in a given year.


Steven V. Miller


Singer, J. David, Stuart Bremer, and John Stuckey. (1972). "Capability Distribution, Uncertainty, and Major Power War, 1820-1965." in Bruce Russett (ed) Peace, War, and Numbers, Beverly Hills: Sage, 19-48.

Singer, J. David. 1987. "Reconstructing the Correlates of War Dataset on Material Capabilities of States, 1816-1985." International Interactions 14(1): 115-32.


# just call `library(tidyverse)` at the top of the your script

cow_ddy %>% add_nmc()

create_stateyears() %>% add_nmc()

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