| http://www.w3.org/ns/prov#value | - Hydrologists are very attentive in the development and use of mathematical models for hydro-logical processes, particularly if these models are to be applied for prediction of future events.They use several indices to assess the prediction skill of their models, and they evaluate the indicesnot only in the model calibration period, but also in a separate validation period, whose data werenot used
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