Abstract
We propose a Random Splitting Model Averaging procedure, RSMA, to achieve stable predictions in high-dimensional linear models. The idea is to use split training data to construct and estimate candidate models and use test data to form a second-level data. The second-level data is used to estimate optimal weights for candidate models by quadratic optimization under non-negative constraints. This procedure has three appealing features: (1) RSMA avoids model overfitting, as a result, gives improved prediction accuracy. (2) By adaptively choosing optimal weights, we obtain more stable predictions via averaging over several candidate models. (3) Based on RSMA, a weighted importance index is proposed to rank the predictors to discriminate relevant predictors from irrelevant ones. Simulation studies and a real data analysis demonstrate that RSMA procedure has excellent predictive performance and the associated weighted importance index could well rank the predictors.
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Acknowledgments
The authors thank the associate editor and two referees for their constructive suggestions that helped them to improve the early manuscript. Lin’s research was supported by the Natural Science Foundation of Shenzhen University (Grant No. 201542). Wang’s research was supported by the National Science Fund for Distinguished Young Scholars in China (Grant No. 10725106), the National Natural Science Foundation of China (Grant No. 11171331 and Grant No. 11331011), a grant from the Key Lab of Random Complex Structure and Data Science, CAS and Natural Science Foundation of Shenzhen University. Zhang’s research was supported by the National Natural Science Foundation of China (Grant No. 11401391), the Project of Department of Education of Guangdong Province of China (Grant No. 2014KTSCX112), and the Natural Science Foundation of Shenzhen University (Grant No. 701, 000360023408). Pang’s research was supported by the Central Research Grant from the Hong Kong Polytechnic University (Grant No. G-YBKQ).
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Lin, B., Wang, Q., Zhang, J. et al. Stable prediction in high-dimensional linear models. Stat Comput 27, 1401–1412 (2017). https://doi.org/10.1007/s11222-016-9694-6
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DOI: https://doi.org/10.1007/s11222-016-9694-6