Evaluation of clinical prediction models (part 2): how to undertake an external validation study

BMJ (Clinical research ed.)(2024)

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Abstract
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.
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