Efficientt Conditional Quantile Estimation: The Time Series Case

Ivana Komunjer and Quang Vuong

University of California at San Diego, Economics Working Paper Series from Department of Economics, UC San Diego

Abstract: In this paper we consider the problem of efficient estimation in conditional quantile models with time series data. Our first result is to derive the semiparametric efficiency bound in time series models of conditional quantiles; this is a nontrivial extension of a large body of work on efficient estimation, which has traditionally focused on models with independent and identically distributed data. In particular, we generalize the bound derived by New and Powell (1990) to the case where the data is weakly dependent and heterogeneous. We then proceed by constructing an M-estimator which achieves the semiparametric efficiency bound. Our efficient M-estimator is obtained by minimizing an objective function which depends on a nonparametric estimator of the conditional distribution of the variable of interest rather than its density.

Keywords: semiparametric efficientcy; time series models; dependence; parametric submodels; conditional quantiles (search for similar items in EconPapers)
Date: 2006-10-01
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Citations: View citations in EconPapers (9)

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