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Distributional regression: CRPS-error bounds for model fitting, model selection and convex aggregation
Clément Dombry, Ahmed Zaoui
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Distributional regression aims at estimating the conditional distribution of a targetvariable given explanatory co-variates. It is a crucial tool for forecasting whena precise uncertainty quantification is required. A popular methodology consistsin fitting a parametric model via empirical risk minimization where the risk ismeasured by the Continuous Rank Probability Score (CRPS). For independentand identically distributed observations, we provide a concentration result for theestimation error and an upper bound for its expectation. Furthermore, we considermodel selection performed by minimization of the validation error and provide aconcentration bound for the regret. A similar result is proved for convex aggregationof models. Finally, we show that our results may be applied to various models suchas Ensemble Model Output Statistics (EMOS), distributional regression networks,distributional nearest neighbors or distributional random forests and we illustrateour findings on two data sets (QSAR aquatic toxicity and Airfoil self-noise).
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