Abstract
Water expenditures variable, as the primary indicator of water consumption, is primordial to analysing and designing water policies. Numerous studies have analyzed water expenditures by considering various factors, including social, spatial, and climate variables predominantly relying on modeling tools often perceived as “black boxes”. In this study, we adopt a different approach, employing D-vine copula quantile regression to scrutinize water expenditures. This method has been proven to be efficient in predicting quantiles for different areas, especially when the normality assumption is inappropriate. Indeed, vine copulas offer the flexibility to select different marginal distributions and a variety of dependence structures. An illustration of the proposed methodology is applied to water consumption in Morocco. The results show different relationships between water expenditures and a set of determinant factors (geographical Area, Sex, and Educational level of the householder), they also show the quantiles’ variability at the regional scale.
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Availability of data and materials
Data are available from the Public Microdata File of the National Survey concerning Household Consumption and Expenditures conducted by the Morrocan High Commission for Planning in 2014 (see Haut Commissariat au Plan (HCP) (2014)). The R code used to generate models, results and graphs is available from the corresponding author upon request.
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Acknowledgements
The authors would like to thank the Editor and the Reviewers for their time and comments that helped improve the manuscript. The authors would also like to thank Samuel Leclerc, a student at the Université de Moncton, for the English language editing.
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This research was supported by the PPR2 8/2016 program, a Moroccan government program to support scientific research.
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W.E.H.: Conceptualization, Methodology, Investigation, Data curation, Formal Analysis, Writing - Original Draft. A.Z.: Conceptualization, Methodology, Writing & Review. E. E.: Conceptualization, Methodology, Writing & Review. S.-E.E.A.: Methodology, Writing & Review.
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Wafaa, E.H., Abdelhak, Z., ElHadj, E. et al. D-vine Copula Quantile Regression for a Multidimensional Water Expenditures Analysis: Social and Regional Impacts. Water Resour Manage (2024). https://doi.org/10.1007/s11269-024-03813-z
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DOI: https://doi.org/10.1007/s11269-024-03813-z