Adaptive estimation of the L2-norm of a probability density and related topics I. Lower bounds
概率密度 L2 范数的自适应估计及相关问题之一:下界AI 解读 ↓
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概率密度 L2 范数的自适应估计及相关问题之一:下界AI 解读 ↓
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We deal with the problem of the adaptive estimation of the L2–norm of a probability density on Rd, d≥1, from independent observations. The unknown density is assumed to be uniformly bounded and to belong to the union of balls in the isotropic/anisotropic Nikolskii’s spaces. We will show that the optimally adaptive estimators over the collection of considered functional classes do no exist. Also, in the framework of an abstract density model we present several generic lower bounds related to the adaptive estimation of an arbitrary functional of a probability density. These results having independent interest have no analogue in the existing literature. In the companion paper (Cleanthous, Georgiadis and Lepski (2024)), we prove that established lower bounds are tight and provide with explicit construction of adaptive estimators of L2–norm of the density.