Evaluation of clinical prediction models (part 3): calculating the sample size required for an external validation study

BMJ. 2024 Jan 22:384:e074821. doi: 10.1136/bmj-2023-074821.

Richard D Riley^{1

2}, Kym I E Snell^{3

2}, Lucinda Archer^{3

2}, Joie Ensor^{3

2}, Thomas P A Debray⁴, Ben van Calster^{5

6}, Maarten van Smeden⁴, Gary S Collins⁷

¹ Institute of Applied Health Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, UK r.d.riley@bham.ac.uk.
² National Institute for Health and Care Research (NIHR) Birmingham Biomedical Research Centre, Birmingham, UK.
³ Institute of Applied Health Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, UK.
⁴ Julius Centre for Health Sciences and Primary Care, University Medical Centre Utrecht, Utrecht University, Utrecht, Netherlands.
⁵ Department of Development and Regeneration, KU Leuven, Leuven, Belgium.
⁶ Department of Biomedical Data Sciences, Leiden University Medical Centre, Leiden, Netherlands.
⁷ Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences, University of Oxford, Oxford, UK.

No abstract available

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