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arXiv 1102.2450math.STstat.TH
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紧致齐次流形上Needlet密度估计的浓度不等式和置信带

Concentration Inequalities and Confidence Bands for Needlet Density Estimators on Compact Homogeneous Manifolds

Gerard Kerkyacharian, Richard Nickl, Dominique Picard

摘要:

令$X_1,...,X_n$是定义在维数为$d \ge 1$的紧致齐次流形$\mathbf M$上的某个未知概率密度$f$的随机样本。考虑一个“针状框架”$\{ϕ_{j η}\}$,它描述了拉普拉斯算子在$\mathbf M$上的本征函数空间上的局部投影,相应的本征值小于$2^{2j}$,如在\cite{GP10}中构造的。我们证明了非渐近集中不等式的一致偏差的线性针状密度估计$f_n(j)$从经验估计的针状投影$\sum_ηϕ_{j η} \int f ϕ_{j η}$的$f$。我们应用这些结果来构建风险自适应估计和非渐近置信带的未知密度$f$。置信带是自适应类的可微和H“{老}-连续函数的$\mathbf M$,达到其Hölder指数。

英文摘要:

Let $X_1,...,X_n$ be a random sample from some unknown probability density $f$ defined on a compact homogeneous manifold $\mathbf M$ of dimension $d \ge 1$. Consider a 'needlet frame' $\{ϕ_{j η}\}$ describing a localised projection onto the space of eigenfunctions of the Laplace operator on $\mathbf M$ with corresponding eigenvalues less than $2^{2j}$, as constructed in \cite{GP10}. We prove non-asymptotic concentration inequalities for the uniform deviations of the linear needlet density estimator $f_n(j)$ obtained from an empirical estimate of the needlet projection $\sum_ηϕ_{j η} \int f ϕ_{j η}$ of $f$. We apply these results to construct risk-adaptive estimators and nonasymptotic confidence bands for the unknown density $f$. The confidence bands are adaptive over classes of differentiable and H\"{older}-continuous functions on $\mathbf M$ that attain their Hölder exponents.

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