Ethnic Power Relations v.1.1

Ethnic Power Relations v.1.1

Up to date version of this dataset can be found at


Lars-Erik Cederman (ETHZ) and Andreas Wimmer (UCLA), Principal investigators
Brian Min (UCLA), Co-principal investigator
Luc Girardin (ETHZ), Web survey design

List of regional and country experts


The Ethnic Power Relations (EPR) dataset identifies all politically relevant ethnic groups and their access to state power in every country of the world from 1946 to 2005. It includes annual data on over 733 groups and codes the degree to which their representatives held executive-level state power—from total control of the government to overt political discrimination.

Based on the input of dozens of regional and country specialists as well as independent research, EPR improves upon existing dataset that provide information on excluded demographic minorities only. EPR is a dynamic dataset that captures changes in ethnic politics over time, unlike static indicators such as ethnic fractionalization indices.

The EPR project is a collaborative effort between researchers at the ETH Zurich and the University of California Los Angeles.

Project home page:


The EPR dataset is available in both country-year and group-country-year format and can be downloaded at Harvard Dataverse together with information on coding rules.


  • Cederman, L.-E., Wimmer, A., and Min, B. (2010). Why Do Ethnic Groups Rebel? New Data and Analysis. World Politics 62(1): 87-119.
  • Wimmer, A., Cederman, L.-E., and Min, B. (2009). Ethnic Politics and Armed Conflict: A Configurational Analysis. American Sociological Review 74(2): 316-337. [www]