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Nonparametric estimation of conditional quantile functions in the presence of irrelevant covariates

Xirong Chen, Degui Li, Qi Li and Zheng Li

Journal of Econometrics, 2019, vol. 212, issue 2, 433-450

Abstract: Allowing for the existence of irrelevant covariates, we study the problem of estimating a conditional quantile function nonparametrically with mixed discrete and continuous data. We estimate the conditional quantile regression function using the check-function-based kernel method and suggest a data-driven cross-validation (CV) approach to simultaneously determine the optimal smoothing parameters and remove the irrelevant covariates. When the number of covariates is large, we first use a screening method to remove the irrelevant covariates and then apply the CV criterion to those that survive the screening procedure. Simulations and an empirical application demonstrate the usefulness of the proposed methods.

Keywords: Cross-validation; Discrete regressors; Irrelevant covariates; Nonparametric quantile regression; Screening (search for similar items in EconPapers)
JEL-codes: C13 C14 C35 (search for similar items in EconPapers)
Date: 2019
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Journal of Econometrics is currently edited by T. Amemiya, A. R. Gallant, J. F. Geweke, C. Hsiao and P. M. Robinson

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