Semiparametric estimation of heterogeneous treatment effects under the nonignorable assignment condition

Keisuke Takahata and Takahiro Hoshino

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Abstract: We propose a semiparametric two-stage least square estimator for the heterogeneous treatment effects (HTE). HTE is the solution to certain integral equation which belongs to the class of Fredholm integral equations of the first kind, which is known to be ill-posed problem. Naive semi/nonparametric methods do not provide stable solution to such problems. Then we propose to approximate the function of interest by orthogonal series under the constraint which makes the inverse mapping of integral to be continuous and eliminates the ill-posedness. We illustrate the performance of the proposed estimator through simulation experiments.

Date: 2019-02
New Economics Papers: this item is included in nep-ecm and nep-exp
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Persistent link: https://EconPapers.repec.org/RePEc:arx:papers:1902.09978

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