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Bias Transmission and Variance Reduction in Two-Stage Quantile Regression

Tae-Hwan Kim () and Christophe Muller ()

No 1221, AMSE Working Papers from Aix-Marseille School of Economics, France

Abstract: In this paper, we propose a variance reduction method for quantile regressions with endogeneity problems. First, we derive the asymptotic distribution of two-stage quantile estimators based on the fitted-value approach under very general conditions on both error terms and exogenous variables. Second, we exhibit a bias transmission property derived from the asymptotic representation of our estimator. Third, using a reformulation of the dependent variable, we improve the efficiency of the two-stage quantile estimators by exploiting a trade-off between an asymptotic bias confined to the intercept estimator and a reduction of the variance of the slope estimator. Monte Carlo simulation results show the excellent performance of our approach. In particular, by combining quantile regressions with first-stage trimmed least-squares estimators, we obtain more accurate slope estimates than 2SLS, 2SLAD and other estimators for a broad range of distributions.

Keywords: Two-Stage Estimation; Variance Reduction; Quantile Regression; Asymptotic Bias. (search for similar items in EconPapers)
JEL-codes: C13 C30 (search for similar items in EconPapers)
New Economics Papers: this item is included in nep-ecm
Date: 2012-07
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