Local Identification of Nonparametric and Semiparametric Models
Xiaohong Chen (),
Sokbae (Simon) Lee () and
No 1795, Cowles Foundation Discussion Papers from Cowles Foundation for Research in Economics, Yale University
In parametric models a sufficient condition for local identification is that the vector of moment conditions is differentiable at the true parameter with full rank derivative matrix. We show that there are corresponding sufficient conditions for nonparametric models. A nonparametric rank condition and differentiability of the moment conditions with respect to a certain norm imply local identification. It turns out these conditions are slightly stronger than needed and are hard to check, so we provide weaker and more primitive conditions. We extend the results to semiparametric models. We illustrate the sufficient conditions with endogenous quantile and single index examples. We also consider a semiparametric habit-based, consumption capital asset pricing model. There we find the rank condition is implied by an integral equation of the second kind having a one-dimensional null space.
Keywords: Identification; Local identification; Nonparametric models; Asset pricing (search for similar items in EconPapers)
JEL-codes: C12 C13 C23 (search for similar items in EconPapers)
New Economics Papers: this item is included in nep-ecm
Note: CFP 1415 & CFP 1415S
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Published in Econometrica (March 2014), 82(2): 785-809
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Journal Article: Local Identification of Nonparametric and Semiparametric Models (2014)
Working Paper: Local Identification of Nonparametric and Semiparametric Models (2012)
Working Paper: Local identification of nonparametric and semiparametric models (2012)
Working Paper: Local identification of nonparametric and semiparametric models (2011)
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