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Ullrika Sahlin. Foto.

Ullrika Sahlin

Universitetslektor

Ullrika Sahlin. Foto.

A suggestion for the quantification of precise and bounded probability to quantify epistemic uncertainty in scientific assessments

Författare

  • Ivette Raices Cruz
  • Matthias C.M. Troffaes
  • Ullrika Sahlin

Summary, in English

An honest communication of uncertainty about quantities of interest enhances transparency in scientific assessments. To support this communication, risk assessors should choose appropriate ways to evaluate and characterize epistemic uncertainty. A full treatment of uncertainty requires methods that distinguish aleatory from epistemic uncertainty. Quantitative expressions for epistemic uncertainty are advantageous in scientific assessments because they are nonambiguous and enable individual uncertainties to be characterized and combined in a systematic way. Since 2019, the European Food Safety Authority (EFSA) recommends assessors to express epistemic uncertainty in conclusions of scientific assessments quantitatively by subjective probability. A subjective probability can be used to represent an expert judgment, which may or may not be updated using Bayes's rule to integrate evidence available for the assessment and could be either precise or approximate. Approximate (or bounded) probabilities may be enough for decision making and allow experts to reach agreement on certainty when they struggle to specify precise subjective probabilities. The difference between the lower and upper bound on a subjective probability can also be used to reflect someone's strength of knowledge. In this article, we demonstrate how to quantify uncertainty by bounded probability, and explicitly distinguish between epistemic and aleatory uncertainty, by means of robust Bayesian analysis, including standard Bayesian analysis through precise probability as a special case. For illustration, the two analyses are applied to an intake assessment.

Avdelning/ar

  • Centrum för miljö- och klimatvetenskap (CEC)
  • Biologiska institutionen
  • Beräkningsvetenskap för hälsa och miljö
  • MERGE: ModElling the Regional and Global Earth system

Publiceringsår

2022

Språk

Engelska

Sidor

239-253

Publikation/Tidskrift/Serie

Risk Analysis

Volym

42

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

John Wiley & Sons Inc.

Ämne

  • Earth and Related Environmental Sciences

Status

Published

Forskningsgrupp

  • Computational Science for Health and Environment

ISBN/ISSN/Övrigt

  • ISSN: 0272-4332