Efficient estimation of semiparametric conditional moment models with possibly nonsmooth residuals

Xiaohong Chen () and Demian Pouzo
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Demian Pouzo: Institute for Fiscal Studies

No CWP09/08, CeMMAP working papers from Centre for Microdata Methods and Practice, Institute for Fiscal Studies

Abstract: For semi/nonparametric conditional moment models containing unknown parametric components ? and unknown functions of endogenous variables (h), Newey and Powell (2003) and Ai and Chen (2003) propose sieve minimum distance (SMD) estimation of (?, h) and derive the large sample properties. This paper greatly extends their results by establishing the followings: (1) The penalized SMD (PSMD) estimator can simultaneously achieve root-n asymptotic normality of the parametric components and nonparametric optimal convergence rate of the nonparametric components, allowing for models with possibly nonsmooth residuals and/or noncompact infinite dimensional parameter spaces. (2) A simple weighted bootstrap procedure can consistently estimate the limiting distribution of the PSMD estimator of the parametric components. (3) The semiparametric efficiency bound results of Ai and Chen (2003) remain valid for conditional models with nonsmooth residuals, and the optimally weighted PSMD estimator achieves the bounds. (4) The profiled optimally weighted PSMD criterion is asymptotically Chi-square distributed, which implies an alternative consistent estimation of confidence region of the efficient PSMD estimator of ?. All the theoretical results are stated in terms of any consistent nonparametric estimator of conditional mean functions. We illustrate our general theories using a partially linear quantile instrumental variables regression, a Monte Carlo study, and an empirical estimation of the shape-invariant quantile Engel curves with endogenous total expenditure.

JEL-codes: C14 C22 (search for similar items in EconPapers)
Date: 2008-05-11
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Citations: View citations in EconPapers (9)

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Related works:
Journal Article: Efficient estimation of semiparametric conditional moment models with possibly nonsmooth residuals (2009)
Working Paper: Efficient Estimation of Semiparametric Conditional Moment Models with Possibly Nonsmooth Residuals (2009)
Working Paper: Efficient estimation of semiparametric conditional moment models with possibly nonsmooth residuals (2009)
Working Paper: Efficient Estimation of Semiparametric Conditional Moment Models with Possibly Nonsmooth Residuals (2008)
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