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Functional coefficient instrumental variables models
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DOI：10.1016/j.jeconom.2005.03.014.png)
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Abstract
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We consider estimation of nonparametric structural models under a functional coefficient representation for the regression function. Under this representation, models are linear in the endogenous components with coefficients given by unknown functions of the predetermined variables, a nonparametric generalization of random coefficient models. The functional coefficient restriction is an intermediate approach between fully nonparametric structural models that are ill posed when endogenous variables are continuously distributed, and partially linear models over which they have appreciable flexibility. We propose two-step estimators that use local linear approximations in both steps. The first step is to estimate a vector of reduced forms of regression models and the second step is local linear regression using the estimated reduced forms as regressors. Our large sample results include consistency and asymptotic normality of the proposed estimators. The high practical power of estimators is illustrated via both a Monte Carlo simulation study and an application to returns to education. (c) 2005 Elsevier B.V. All rights reserved.
Keywords:
endogenous variables
functional coefficient models
instrumental variables
local linear fitting
nonparametric smoothing
simultaneous equations
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