On the probabilities of correct or incorrect majority preference relations

Ilia Tsetlin and Michel Regenwetter

Social Choice and Welfare, 2003, vol. 20, issue 2, 283-306

Abstract: While majority cycles may pose a threat to democratic decision making, actual decisions based inadvertently upon an incorrect majority preference relation may be far more expensive to society. We study majority rule both in a statistical sampling and a Bayesian inference framework. Based on any given paired comparison probabilities or ranking probabilities in a population (i.e., culture) of reference, we derive upper and lower bounds on the probability of a correct or incorrect majority social welfare relation in a random sample (with replacement). We also present upper and lower bounds on the probabilities of majority preference relations in the population given a sample, using Bayesian updating. These bounds permit to map quite precisely the entire picture of possible majority preference relations as well as their probabilities. We illustrate our results using survey data. Copyright Springer-Verlag Berlin Heidelberg 2003

Date: 2003
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DOI: 10.1007/s003550200182

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