Statistical downscaling of rainfall data using sparse variable selection methods |
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Authors: | A Phatak BC Bates SP Charles |
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Affiliation: | aCSIRO Climate Adaptation Flagship, Australia;bCSIRO Mathematical & Information Sciences, Private Bag 5, Wembley, WA 6913, Australia;cCSIRO Marine & Atmospheric Research, Private Bag 5, Wembley, WA 6913, Australia;dCSIRO Land & Water, Private Bag 5, Wembley, WA 6913, Australia |
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Abstract: | In many statistical downscaling methods, atmospheric variables are chosen by using a combination of expert knowledge with empirical measures such as correlations and partial correlations. In this short communication, we describe the use of a fast, sparse variable selection method, known as RaVE, for selecting atmospheric predictors, and illustrate its use on rainfall occurrence at stations in South Australia. We show that RaVE generates parsimonious models that are both sensible and interpretable, and whose results compare favourably to those obtained by a non-homogeneous hidden Markov model (Hughes et al., 1999). |
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Keywords: | Statistical downscaling Variable selection L1-norm Sparse variable selection Logistic regression |
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