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Validation in prediction research: the waste by data splitting.
Journal of Clinical Epidemiology 2018 July 30
Accurate prediction of medical outcomes is important for diagnosis and prognosis. The standard requirement in major medical journals is nowadays that validity outside the development sample needs to be shown. Is such data splitting an example of a waste of resources? In large samples, interest should shift to assessment of heterogeneity in model performance across settings. In small samples, cross-validation and bootstrapping are more efficient approaches. In conclusion, random data splitting should be abolished for validation of prediction models.
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