Studying electoral cleavages with a covoting regression model

Abstract

Ethnicity is an important cleavage in Africa, yet its influence on voting is contested. Existing micro-level analyses often focus on electoral support for a subset of candidates or parties, while meso- and macro-level approaches infer individual motivations from aggregate outcomes. The risk of selection bias arises from the former approach, while omitted-variable bias may result from the latter. Our new covoting regression (CVR) tackles several of these challenges. It estimates the effect of coethnicity on the probability that pairs of voters covote for the same party/candidate while conditioning on other characteristics shared between them. Thereby, CVR mirrors the micro foundations of widely used aggregate indicators, such as the Herfindahl-Hirschman indices of party concentration and ethnic homogeneity. Our data consist of dyadic comparisons between respondents from Afrobarometer surveys. Pooling across 27 countries, coethnicity increases covoting intentions by 17 percentage points. The effect of coethnicity is driven by politically relevant groups and covoting for ethnic parties. It is consistent across institutionally diverse countries and at least four times larger than that of other cleavages. Beyond ethnicity, we address key issues in studying electoral consequences of socioeconomic cleavages and bridge gaps between levels of analysis.

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Carl Müller-Crepon Carl Müller-Crepon is an assistant professor in the Department of Government, London School of Economics and Political Science.

Nils-Christian Bormann Nils-Christian Bormann is a professor of international political studies at the Witten/Herdecke University.