Semiparametric Efficiency in Convexity Constrained Single-Index Model
Semiparametric Efficiency in Convexity Constrained Single-Index Model
复制标题
凸约束单指标模型中的半参数效率
DOI:
10.1080/01621459.2021.1927741
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发表时间:
2023
影响因子:
3.7
通讯作者:
Sen, Bodhisattva
中科院分区:
文献类型:
--
作者:
Kuchibhotla, Arun K.;Patra, Rohit K.;Sen, Bodhisattva
We consider estimation and inference in a single-index regression model with an unknown convex link function. We introduce a convex and Lipschitz constrained least-square estimator (CLSE) for both the parametric and the nonparametric components given independent and identically distributed observations. We prove the consistency and find the rates of convergence of the CLSE when the errors are assumed to have onlymoments and are allowed to depend on the covariates. When, we establish-rate of convergence and asymptotic normality of the estimator of the parametric component. Moreover, the CLSE is proved to be semiparametrically efficient if the errors happen to be homoscedastic. We develop and implement a numerically stable and computationally fast algorithm to compute our proposed estimator in the R package simest. We illustrate our methodology through extensive simulations and data analysis. Finally, our proof of efficiency is geometric and provides a general framework that can be used to prove efficiency of estimators in a wide variety of semiparametric models even when they do not satisfy the efficient score equation directly. Supplementary files for this article are available online.
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影响因子:
5.4
作者:
S. Dharanipragada;K. Arun
通讯作者:
K. Arun
影响因子:
0.5
作者:
S. Murphy;A. Vaart;J. Wellner
通讯作者:
S. Murphy;A. Vaart;J. Wellner
DOI:
--
发表时间:
1998
期刊:
影响因子:
--
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通讯作者:
F. Brambila
影响因子:
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作者:
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通讯作者:
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DOI:
10.1287/ijoc.2013.0587
发表时间:
2014
期刊:
INFORMS J. Comput.
影响因子:
--
作者:
Eunji Lim
通讯作者:
Eunji Lim