Statistical process control for validating a classification tree model for predicting mortality - A novel approach towards temporal validation

► We present a new approach for validation using statistical process control. ► We stress the need for continuous validation of prognostic models over time. ► Validation of individual tree-nodes provides insights into concept drifts. ► The adequacy of tree-models depends on their intended use. ► Tree-models have insufficient ability to react to a changed environment.