Abstract

Given a random vector X valued in ℝ d with density f and an arbitrary probability number p∈(0; 1), we consider the estimation of the upper level set<texlscub>f≥t (p)</texlscub>of f corresponding to probability content p, that is, such that the probability that X belongs to<texlscub>f≥t (p)</texlscub>is equal to p. Based on an i.i.d. random sample X 1, …, X n drawn from f, we define the plug-in level set estimate , where is a random threshold depending on the sample and [fcirc] n is a nonparametric kernel density estimate based on the same sample. We establish the exact convergence rate of the Lebesgue measure of the symmetric difference between the estimated and actual level sets.

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