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• W1890804916 abstract "[1] Water resource management requires robust assessment of the consequences of future states of the resource, and, when dependent on prediction models, it requires assessment of the uncertainties associated with those predictions. Ensemble prediction/forecast systems have been extensively used to address such issues and seek to provide a collection of predictions, via a collection of parameters, with intent to bracket future observations. However, such methods do not have well-established finite-sample properties and generally require large samples to additionally determine better performing predictions, for example, in nonlinear probabilistic ensemble methods. We here propose a different paradigm, based on Vapnik-Chervonenkis (VC) generalization theory, for robust parameter selection and prediction. It is based on a concept of complexity (that is data-independent) that relates finite sample performance of a model to its performance when a large sample of the same underlying process is available. We employ a nearest neighbor method as the underlying prediction model, introduce a procedure to compute its VC dimension, and test how the two paradigms handle uncertainty in one step ahead daily streamflow prediction for three basins. In both paradigms, the predictions become more efficient and less biased with increasing sample size. However, the complexity-based paradigm has a better bias-variance tradeoff property for small sample sizes. The uncertainty bounds on predictions resulting from ensemble methods behave in an inconsistent manner for smaller basins, suggesting the need for further postprocessing of ensemble members and uncertainty surrounding them before using them in modeling uncertainty estimation. Finally, complexity-based predictions appear to mimic the complexity of the underlying processes via input dimensionality selection of the nearest neighbor model." @default.
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• W1890804916 date "2009-10-01" @default.
• W1890804916 modified "2023-09-24" @default.
• W1890804916 title "Complexity-based robust hydrologic prediction" @default.
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• W1890804916 doi "https://doi.org/10.1029/2008wr007524" @default.
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