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Exploring the "psychometric paradigm": comparisons between aggregate and individual analyses

C Marris1, I Langford, T Saunderson

  • 1School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom.

Risk Analysis : an Official Publication of the Society for Risk Analysis
|June 1, 1997
PubMed
Summary

This study challenges the psychometric paradigm by showing individual differences in risk perception and hazard characteristics. Findings highlight the need for nuanced risk communication strategies, especially regarding knowledge gaps.

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Area of Science:

  • Risk perception research
  • Environmental psychology
  • Decision science

Background:

  • The psychometric paradigm, developed by Slovic, Fischhoff, and Lichtenstein, significantly advanced understanding of public risk attitudes.
  • Initial applications of this paradigm often aggregated data, treating risk characteristics as inherent attributes without differentiating individual responses.
  • A key limitation was the limited distinction between individuals or groups beyond 'experts' versus 'lay people'.

Purpose of the Study:

  • To examine the validity of the assumption that risk characteristics are inherent attributes.
  • To investigate individual variations in risk perception and the rating of risk characteristics.
  • To compare aggregate-level findings with individual-level analyses in risk perception studies.

Main Methods:

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  • A questionnaire survey, mirroring designs by Slovic et al., was administered to 131 Norwich residents.
  • Data analysis was conducted at both the aggregate level (using mean scores) and the individual level.
  • Statistical comparisons were made between aggregate intercorrelations of risk characteristics and individual-level findings.

Main Results:

  • Individuals demonstrated significant variation in perceiving the same risk and rating its characteristics.
  • Strong intercorrelations between risk characteristics observed at the aggregate level were not consistently supported at the individual level.
  • The psychometric paradigm's inferred relationships between risk characteristics and perceptions generally held at the individual level, with notable exceptions.

Conclusions:

  • Individual-level analysis reveals heterogeneity in risk perception, challenging aggregate assumptions.
  • The relationship between 'lack of knowledge' and risk perception is complex and requires careful consideration in communication.
  • Risk communication strategies must account for individual differences to be effective.