Evaluation of clinical prediction models (part 3): calculating the sample size required for an external validation study.
Where this comes from
- Record sourced from PubMed, PMID 38253388.
- Also identified by DOI 10.1136/bmj-2023-074821 and PMC identifier 11778934.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
An external validation study evaluates the performance of a prediction model in new data, but many of these studies are too small to provide reliable answers. In the third article of their series on model evaluation, Riley and colleagues describe how to calculate the sample size required for external validation studies, and propose to avoid rules of thumb by tailoring calculations to the model and setting at hand.
Medical subject headings
- Models, Statistical