add_creg_fractionalization: Add fractionalization/polarization estimates from CREG to a...

View source: R/add_creg_fractionalization.R

add_creg_fractionalizationR Documentation

Add fractionalization/polarization estimates from CREG to a data frame


add_creg_fractionalization() allows you to add information about the fractionalization/polarization of a state's ethnic and religious groups to your data.





a data frame with appropriate peacesciencer attributes


Please see the information for the underlying data creg, and the associated R script in the data-raw directory, to see how these data are generated.

The creg data have a few duplicates. When standardizing to true CoW codes, the duplicates concern Serbia/Yugoslavia in 1991 and 1992 as well as Russia/the Soviet Union in 1991. When standardizing to true Gleditsch-Ward codes, the duplicates concern Serbia/Yugoslavia in 1991 and Russia/Soviet Union in 1991. In those cases, the function does a group-by arrange for the more fractionalized/polarized estimate under the (reasonable, I think) assumption that these are estimates prior to the dissolution of those states. If this is problematic, feel free to consult the underlying data and merge those in manually.

The underlying data have both Gleditsch-Ward codes and Correlates of War codes. The merge it makes depends on what you declare as the "master" system at the top of the pipe (i.e. in create_dyadyears() or create_stateyears()). If, for example, you run create_stateyears(system="cow") and follow it with add_gwcode_to_cow(), the merge will be on the Correlates of War codes and not the Gleditsch-Ward codes. You can see the script mechanics to see how this is achieved.

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_creg_fractionalization() takes a dyad-year, leader-year, leader-dyad-year, or state-data frame, whether the primary state identifiers are from the Correlates of War system or the Gleditsch-Ward system, and returns information about the fractionalization and polarization of the state(s) in a given year. The function returns four additional columns when the data are state-year and returns eight additional columns when the data are state-year (or leader-year). The columns returned are the fractionalization of ethnic groups, the polarization of ethnic groups, the fractionalization of religious groups, and the polarization of religious groups. When the data are dyad-year (or leader-dyad-year), the return doubles because it provides information for both states in the dyad.


Steven V. Miller


Alesina, Alberto, Arnaud Devleeschauwer, William Easterly, Sergio Kurlat and Romain Wacziarg. 2003. "Fractionalization". Journal of Economic Growth 8: 155-194.

Montalvo, Jose G. and Marta Reynal-Querol. 2005. "Ethnic Polarization, Potential Conflict, and Civil Wars" American Economic Review 95(3): 796–816.

Nardulli, Peter F., Cara J. Wong, Ajay Singh, Buddy Petyon, and Joseph Bajjalieh. 2012. The Composition of Religious and Ethnic Groups (CREG) Project. Cline Center for Democracy.


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

cow_ddy %>% add_creg_fractionalization()

create_stateyears() %>% add_creg_fractionalization()

create_stateyears(system = "gw") %>% add_creg_fractionalization()

peacesciencer documentation built on March 24, 2022, 5:06 p.m.