Yongxin Bai, Maozai Tian, Tang Man-Lai, Lee Wing-Yan

【Publication Time】2020.06.01

【Lead Author】Yongxin Bai 

【Journal】 STATISTICAL METHODS IN MEDICAL RESEARCH

【Abstract】

In this paper, we consider variable selection for ultra-high dimensional quantile regression model with missing data and measurement errors in covariates. Specifically, we correct the bias in the loss function caused by measurement error by applying the orthogonal quantile regression approach and remove the bias caused by missing data using the inverse probability weighting. A nonconvex Atan penalized estimation method is proposed for simultaneous variable selection and estimation. With the proper choice of the regularization parameter and under some relaxed conditions, we show that the proposed estimate enjoys the oracle properties. The choice of smoothing parameters is also discussed. The performance of the proposed variable selection procedure is assessed by Monte Carlo simulation studies. We further demonstrate the proposed procedure with a breast cancer data set.

【Keywords】

Quantile regression, Atan penalty, measurement error, missing data, HBIC criterion