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On the probability ratio index as a measure of electoral competition

Economics

On the probability ratio index as a measure of electoral competition

S. R. Chakravarty, M. Mitra, et al.

Discover the innovative probability ratio index, developed by Satya R. Chakravarty, Manipushpak Mitra, Suresh Mutuswami, and Rupayan Pal, to assess electoral competitiveness like never before! This cutting-edge measure offers a solution to the challenges posed by existing indices, providing a clearer picture of political landscapes across diverse elections.

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Playback language: English
Abstract
This paper introduces a new index, the probability ratio index, to quantify electoral competitiveness. This index is designed to be comparable across elections with varying numbers of parties, addressing a limitation of existing indices. It's based on the probability that two randomly selected voters voted for different parties, normalized to range from 0 (no competition) to 1 (full competition). The index is inversely related to the Herfindahl-Hirschman index and the squared coefficient of variation, and directly related to the fractionalization index. Examples demonstrate its advantages over existing measures.
Publisher
Palgrave Communications
Published On
May 13, 2020
Authors
Satya R. Chakravarty, Manipushpak Mitra, Suresh Mutuswami, Rupayan Pal
Tags
electoral competitiveness
probability ratio index
political competition
voter behavior
election analysis
measures of competitiveness

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