Partisan bias and the bayesian ideal in the study of public opinion

Research output: Contribution to journalArticlepeer-review

108 Scopus citations


Bayes Theorem is increasingly used as a benchmark against which to judge the quality of citizens thinking, but some of its implications are not well understood. A common claim is that Bayesians must agree more as they learn and that the failure of partisans to do the same is evidence of bias in their responses to new information. Formal inspection of Bayesian learning models shows that this is a misunderstanding. Learning need not create agreement among Bayesians. Disagreement among partisans is never clear evidence of bias. And although most partisans are not Bayesians, their reactions to new information are surprisingly consistent with the ideal of Bayesian rationality.

Original languageEnglish (US)
Pages (from-to)1109-1124
Number of pages16
JournalJournal of Politics
Issue number3
StatePublished - Jul 2009

ASJC Scopus subject areas

  • Sociology and Political Science


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