On optimal estimation of the mode in nonparametric deconvolution problems
On optimal estimation of the mode in nonparametric deconvolution problems
复制标题
非参数反卷积问题中模式的最优估计
DOI:
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发表时间:
2010
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通讯作者:
B. Wieczorek
中科院分区:
文献类型:
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作者:
B. Wieczorek
This work deals with the problem of estimating the mode in nonparametric deconvolution models. First, given n i.i.d. observations from Y=X+ϵ, we consider estimating the mode θ of a density function of some random variable X. Second, we consider the errors-in-variables regression model, where we are interested in the mode of m(x)=E(Z|X=x), where n i.i.d. observations from (Y, Z) with Y=X+ϵ are given. In both cases, we assume the distribution of ϵ to be ordinary smooth. The mode estimator ˆθ n is defined via maximising over a curve estimator of the kernel type. In both deconvolution models, we obtain rates for the quadratic risk of ˆθ n , depending on the smoothness of the underlying curve and the degree of ill-posedness of the deconvolution problem. Further, we show that these rates are optimal, considering one-dimensional subproblems in the class of functions studied.