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Improving and Validating Survey Estimates of Religious Demography Using Bayesian Multilevel Models and Poststratification

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  • Christopher Claassen
  • Richard Traunmüller

Abstract

Religious group size, demographic composition, and the dynamics thereof are of interest in many areas of social science including migration, social cohesion, parties and voting, and violent conflict. Existing estimates however are of varying and perhaps poor quality because many countries do not collect official data on religious identity. We propose a method for accurately measuring religious group demographics using existing survey data: Bayesian multilevel regression models with poststratification. We illustrate this method by estimating the demography of Muslims, Hindus, and Jews in Great Britain over a 20-year period and validate it by comparing our estimates to UK census data on religious demography. Our estimates are very accurate, differing from true population proportions by as little as 0.29 (Muslim) to 0.04 (Jewish) percentage points. These findings have implications for the measurement of religious demography as well as small group attributes more generally.

Suggested Citation

  • Christopher Claassen & Richard Traunmüller, 2020. "Improving and Validating Survey Estimates of Religious Demography Using Bayesian Multilevel Models and Poststratification," Sociological Methods & Research, , vol. 49(3), pages 603-636, August.
    • Handle: RePEc:sae:somere:v:49:y:2020:i:3:p:603-636
    DOI: 10.1177/0049124118769086
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