Abstract
The present paper aims to model statistical structure of heavy-tailed precipitation data. In particular for agricultural purposes in Canadian Prairies, this is essential in many aspects such as assessing and managing risks resulting from the occurrence of unexpected precipitation events. Daily (or weekly) precipitation time series often contain many zeros (on dry days) and also exhibit important characteristics such as heavy-tailedness and volatility clustering. These features make it challenging to develop an effective model from both theoretical and practical viewpoints. In this paper, we propose a dynamic mixture model constructed based on a generalized Gaussian crack distribution with a GARCH specification to take into account the full range of precipitation measurements with a sufficient flexibility to fit both thin- and heavy-tailed data, and stochastic volatility. The method of maximum likelihood estimation with the profile log-likelihood algorithm is illustrated with some simulation studies. The model fitting results on a historical dataset from twelve stations in Canadian Prairies show the applicability of the proposed model.
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Availability of data and material
The datasets used in this study are available at the Government of Canada’s official website (http://www.climate.weather.gc.ca).
Code availability
The R codes may be provided upon request.
Notes
In the literature, GARCH(1,1) process is often used to model precipitation time series (Modarres and Ouarda , 2013).
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Acknowledgements
The authors are grateful to the anonymous reviewers for valuable comments and suggestions.
Funding
This research is supported by the Discovery Development Grant from the Natural Sciences and Engineering Research Council of Canada (grant number DDG-2019-06064).
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All authors contributed to the study conception and design. Data collection and analysis were performed by Maral Mazjini. All authors read and approved the final manuscript.
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Mazjini, M., Bae, T. Statistical modelling of precipitation data in Canadian Prairies with a dynamic mixture structure. Theor Appl Climatol 153, 173–192 (2023). https://doi.org/10.1007/s00704-023-04419-y
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DOI: https://doi.org/10.1007/s00704-023-04419-y