Feature Screening and Error Variance Estimation for Ultrahigh-Dimensional Linear Model with Measurement Errors
Hengjian Cui , Feng Zou , Li Ling
Communications in Mathematics and Statistics ›› : 1 -33.
Feature Screening and Error Variance Estimation for Ultrahigh-Dimensional Linear Model with Measurement Errors
In this paper, we mainly study the feature screening and error variance estimation in ultrahigh-dimensional linear model with errors-in-variables (EV). Given that sure independence screening (SIS) method by marginal Pearson’s correlation learning may omit some important observation variables due to measurement errors, a corrected SIS called EVSIS is proposed to rank the importance of features according to their corrected marginal correlation with the response variable. Also, a corrected error variance procedure is proposed to accurately estimate the error variance, which could greatly attenuate the influence of measurement errors and spurious correlations, simultaneously. Under some regularization conditions, the proposed EVSIS possesses sure screening property and consistency in ranking and the corrected error variance estimator is also proved to be asymptotically normal. The two methodologies are illustrated by some simulations and a real data example, which suggests that the proposed methods perform well.
Ultrahigh-dimensional linear model / Measurement error / Feature screening / Error variance estimation / Sure screening property / Asymptotic properties
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