Evaluation of clinical prediction models (part 2): how to undertake an external validation study
Richard D Riley, Lucinda Archer, Kym I E Snell, Joie Ensor, Paula Dhiman, Glen Philip Martin, Laura Jayne Bonnett, Professor Gary S. Collins · BMJ · 2024
External validation studies are an important but often neglected part of prediction model research. In this article, the second in a series on model evaluation, Riley and colleagues explain what an external validation study entails and describe the key steps involved, from establishing a high quality dataset to evaluating a model’s predictive performance and clinical usefulness.