Quantile regression for longitudinal data with a working correlation model

Liya Fu and You-Gan Wang

Computational Statistics & Data Analysis, 2012, vol. 56, issue 8, 2526-2538

Abstract: This paper proposes a linear quantile regression analysis method for longitudinal data that combines the between- and within-subject estimating functions, which incorporates the correlations between repeated measurements. Therefore, the proposed method results in more efficient parameter estimation relative to the estimating functions based on an independence working model. To reduce computational burdens, the induced smoothing method is introduced to obtain parameter estimates and their variances. Under some regularity conditions, the estimators derived by the induced smoothing method are consistent and have asymptotically normal distributions. A number of simulation studies are carried out to evaluate the performance of the proposed method. The results indicate that the efficiency gain for the proposed method is substantial especially when strong within correlations exist. Finally, a dataset from the audiology growth research is used to illustrate the proposed methodology.

Keywords: Covariance estimate; Unbiased estimating functions; Exchangeable correlation structure; Independence working model; Induced smoothing method (search for similar items in EconPapers)
Date: 2012
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Citations: View citations in EconPapers (22)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:csdana:v:56:y:2012:i:8:p:2526-2538

DOI: 10.1016/j.csda.2012.02.005

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