Focused information criterion and model averaging based on weighted composite quantile regression

Ganggang Xu, Suojin Wang, Jianhua Z. Huang

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


We study the focused information criterion and frequentist model averaging and their application to post-model-selection inference for weighted composite quantile regression (WCQR) in the context of the additive partial linear models. With the non-parametric functions approximated by polynomial splines, we show that, under certain conditions, the asymptotic distribution of the frequentist model averaging WCQR-estimator of a focused parameter is a non-linear mixture of normal distributions. This asymptotic distribution is used to construct confidence intervals that achieve the nominal coverage probability. With properly chosen weights, the focused information criterion based WCQR estimators are not only robust to outliers and non-normal residuals but also can achieve efficiency close to the maximum likelihood estimator, without assuming the true error distribution. Simulation studies and a real data analysis are used to illustrate the effectiveness of the proposed procedure. © 2013 Board of the Foundation of the Scandinavian Journal of Statistics..
Original languageEnglish (US)
Pages (from-to)365-381
Number of pages17
JournalScandinavian Journal of Statistics
Issue number2
StatePublished - Aug 13 2013
Externally publishedYes


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