Cited by 371Statistical Methods in EpidemiologyClinical Reasoning and Diagnostic SkillsMeta-analysis and systematic reviews

Calibration of Risk Prediction Models: Impact on Decision-Analytic Performance

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Van Calster, Ben, Vickers, Andrew J.·2015·Medical Decision Making

Abstract

Decision-analytic measures to assess clinical utility of prediction models and diagnostic tests incorporate the relative clinical consequences of true and false positives without the need for external information such as monetary costs. Net Benefit is a commonly used metric that weights the relative consequences in terms of the risk threshold at which a patient would opt for treatment. Theoretical results demonstrate that clinical utility is affected by a model';s calibration, the extent to which estimated risks correspond to observed event rates. We analyzed the effects of different types of miscalibration on Net Benefit and investigated whether and under what circumstances miscalibration can make a model clinically harmful. Clinical harm is defined as a lower Net Benefit compared with classifying all patients as positive or negative by default. We used simulated data to investigate the effect of overestimation, underestimation, overfitting (estimated risks too extreme), and underfitting (estimated risks too close to baseline risk) on Net Benefit for different choices of the risk threshold. In accordance with theory, we observed that miscalibration always reduced Net Benefit. Harm was sometimes observed when models underestimated risk at a threshold below the event rate (as in underestimation and overfitting) or overestimated risk at a threshold above event rate (as in overestimation and overfitting). Underfitting never resulted in a harmful model. The impact of miscalibration decreased with increasing discrimination. Net Benefit was less sensitive to miscalibration for risk thresholds close to the event rate than for other thresholds. We illustrate these findings with examples from the literature and with a case study on testicular cancer diagnosis. Our findings strengthen the importance of obtaining calibrated risk models.

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Authors
Van Calster, B., & Vickers, A. J.
Affiliations
  • KU Leuven, Department of Development and Regeneration, Leuven, Belgium (BVC)
  • Memorial Sloan Kettering Cancer Center (US)
Venue
Medical Decision Making
Published
2014-08-25
Volume
35
Issue
2
Pages
162-169
ISSN
  • 0272-989X (ISSN-L)
  • 1552-681X
OpenAlex
W2054193584
Cited by
371
References
29
Citations by year
2026: 44 · 2025: 39 · 2024: 48 · 2023: 40 · 2022: 57 · 2021: 40 · 2020: 31 · 2019: 29 · 2018: 10 · 2017: 19 · 2016: 7 · 2015: 6 · 2014: 1
FWCI
11.61
Type
journal article
Language
en
Open access
Locations
  • Medical Decision Making (publishedVersion)
  • PubMed (publishedVersion)
  • Lirias (submittedVersion, other-oa)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • Fonds Wetenschappelijk Onderzoek
  • Vlaamse regering
Topics
  • Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods in Epidemiology
  • Health Sciences › Medicine › Family Practice › Clinical Reasoning and Diagnostic Skills
  • Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Meta-analysis and systematic reviews
Keywords
risk prediction model, model calibration, net benefit, clinical utility, calibration error, overfitting, underfitting, risk overestimation, risk underestimation, risk thresholds, model discrimination, testicular cancer diagnosis
MeSH terms
Computer Simulation, Decision Support Techniques, Humans, Male, Models, Theoretical, Norway, Predictive Value of Tests, ROC Curve, Testicular Neoplasms, Bias, Linear Models, Risk Assessment

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