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Quantile regression in varying-coefficient models: non-crossing quantile curves and heteroscedasticity

Author

Listed:
  • Y. Andriyana

    (KU Leuven
    Universitas Padjadjaran)

  • I. Gijbels

    (KU Leuven)

  • A. Verhasselt

    (Universiteit Hasselt)

Abstract

Quantile regression is an important tool for describing the characteristics of conditional distributions. Population conditional quantile functions cannot cross for different quantile orders. Unfortunately estimated regression quantile curves often violate this and cross each other, which can be very annoying for interpretations and further analysis. In this paper we are concerned with flexible varying-coefficient modelling, and develop methods for quantile regression that ensure that the estimated quantile curves do not cross. A second aim of the paper is to allow for some heteroscedasticity in the error modelling, and to also estimate the associated variability function. We investigate the finite-sample performances of the discussed methods via simulation studies. Some applications to real data illustrate the use of the methods in practical settings.

Suggested Citation

  • Y. Andriyana & I. Gijbels & A. Verhasselt, 2018. "Quantile regression in varying-coefficient models: non-crossing quantile curves and heteroscedasticity," Statistical Papers, Springer, vol. 59(4), pages 1589-1621, December.
    • Handle: RePEc:spr:stpapr:v:59:y:2018:i:4:d:10.1007_s00362-016-0847-7
    DOI: 10.1007/s00362-016-0847-7
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