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Estimation methods for non-homogeneous regression models: Minimum continuous ranked probability score vs. maximum likelihood

Manuel Gebetsberger (), Jakob W. Messner (), Georg J. Mayr () and Achim Zeileis ()

Working Papers from Faculty of Economics and Statistics, University of Innsbruck

Abstract: Non-homogeneous regression models are widely used to statistically post-process numerical ensemble weather prediction models. Such regression models are capable of forecasting full probability distributions and correct for ensemble errors in the mean and variance. To estimate the corresponding regression coefficients, minimization of the continuous ranked probability score (CRPS) has widely been used in meteorological post-processing studies and has often been found to yield more calibrated forecasts compared to maximum likelihood estimation. From a theoretical perspective, both estimators are consistent and should lead to similar results, provided the correct distribution assumption about empirical data. Differences between the estimated values indicate a wrong specification of the regression model. This study compares the two estimators for probabilistic temperature forecasting with non-homogeneous regression, where results show discrepancies for the classical Gaussian assumption. The heavy-tailed logistic and Student-t distributions can improve forecast performance in terms of sharpness and calibration, and lead to only minor differences between the estimators employed. Finally, a simulation study confirms the importance of appropriate distribution assumptions and shows that for a correctly specified model the maximum likelihood estimator is slightly more efficient than the CRPS estimator.

Keywords: ensemble post-processing; maximum likelihood; CRPS minimization; probabilistic forecasting; distributional regression models (search for similar items in EconPapers)
JEL-codes: C13 C15 C16 C51 C61 (search for similar items in EconPapers)
New Economics Papers: this item is included in nep-ecm, nep-for and nep-ore
Date: 2017-11
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