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A Multi-imputation Method to Deal With Hydro-Meteorological Missing Values by Integrating Chain Equations and Random Forest

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Abstract

Imputing hydro-meteorological missing values is essential in time series modeling. Imputation of missing values was traditionally performed after an observation period, which cannot effectively support water resources management in time. Therefore, it is necessary to deal with the missing data online. Moreover, traditional imputation methods usually consider only one observation variable and generate one set of imputations, which cannot describe the imputation uncertainty. Thus, a multiple-imputation method is proposed in this paper by integrating chain equations and random forest, namely, MICE-RF, to deal with the hydro-meteorological missing values. MICE-RF first simulates multiple imputation series to obtain the optimal imputations using the evaluation results of multiple imputation series. The traditional linear imputation, mean imputation, spline imputation, and k nearest neighbor imputation are compared to illustrate the robustness, reliability, and accuracy of the MICE-RF. According to the results, the MICE-RF provides the best imputation accuracy and can be easily implemented online.

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Data used in the research work have been acknowledged, and data and code are available on request.

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Acknowledgements

I sincerely appreciate the data provided by the China Meteorological Data Service Center.

Funding

This work was supported by National Natural Science Foundation of China (Grant No. 51679186), Natural Science Basic Research Program of Shaanxi Province (Grant No. 2019JLZ-15, 2019JLZ-16, 2017JQ5076), and Special Scientific Research Program of Shaanxi Provincial Education Department (Grant No. 17JK0558). The authors thank the editor for their comments and suggestions.

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Contributions

Conceptualization: Xin Jing; Methodology: Xin Jing and Zuo GG; Writing-original draft preparation: Xin Jing and Wang JM; Writing-review and editing: Luo JG, Wei N, and Zuo GG; Funding acquisition: Luo JG.

Corresponding author

Correspondence to Jungang Luo.

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Appendix

Appendix

Table 2 MAE evaluation of each imputation method in different scenarios
Table 3 RMSE evaluation of each imputation method in different scenarios
Table 4 NSE evaluation of each imputation method in different scenarios

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Jing, X., Luo, J., Wang, J. et al. A Multi-imputation Method to Deal With Hydro-Meteorological Missing Values by Integrating Chain Equations and Random Forest. Water Resour Manage 36, 1159–1173 (2022). https://doi.org/10.1007/s11269-021-03037-5

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  • DOI: https://doi.org/10.1007/s11269-021-03037-5

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