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arXiv 1105.3018math.STstat.TH
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估计逆回归函数的两阶段混合方法

A two-stage hybrid procedure for estimating an inverse regression function

Runlong Tang, Moulinath Banerjee, George Michailidis

摘要:

我们考虑一个两阶段的程序(TSP),用于估计逆回归函数在一个给定的点,其中保序回归是在第一阶段使用,以获得一个初始估计和本地线性逼近在附近的这个估计是在第二阶段使用。我们证明了第二阶段估计的收敛速度可以达到参数$n^{1/2}$的收敛速度。此外,一个自举的变体TSP(BTSP)的介绍和它的一致性研究。该变型设法克服了依分布收敛和回归函数在未知目标量处的导数估计的缓慢速度。最后,通过仿真研究了BTSP的有限样本性能,并在一个数据集上说明了该方法。

英文摘要:

We consider a two-stage procedure (TSP) for estimating an inverse regression function at a given point, where isotonic regression is used at stage one to obtain an initial estimate and a local linear approximation in the vicinity of this estimate is used at stage two. We establish that the convergence rate of the second-stage estimate can attain the parametric $n^{1/2}$ rate. Furthermore, a bootstrapped variant of TSP (BTSP) is introduced and its consistency properties studied. This variant manages to overcome the slow speed of the convergence in distribution and the estimation of the derivative of the regression function at the unknown target quantity. Finally, the finite sample performance of BTSP is studied through simulations and the method is illustrated on a data set.

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