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arXiv 1602.05565math.PR
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$\mathcal{W}_2$距离上具有近最优收敛速度的高维CLT

A high-dimensional CLT in $\mathcal{W}_2$ distance with near optimal convergence rate

Alex Zhai

摘要:

设$X_1, \ldots , X_n$为i.i.d.。$\mathbb{R}^d$中的随机向量与$\|X_1\| \le β$。然后,我们表明,$\frac{1}{\sqrt{n}}(X_1 + \ldots + X_n)$收敛到高斯在二次运输(也称为“Kantorovich”或“Wasserstein”)的速度为$O\left( \frac{\sqrt{d} β\log n}{\sqrt{n}} \right)$的距离,改善了结果的英勇和英勇。我们的定理的主要特点是收敛速度是在$\log n$的最优$n, d \rightarrow \infty$。

英文摘要:

Let $X_1, \ldots , X_n$ be i.i.d. random vectors in $\mathbb{R}^d$ with $\|X_1\| \le β$. Then, we show that $\frac{1}{\sqrt{n}}(X_1 + \ldots + X_n)$ converges to a Gaussian in quadratic transportation (also known as "Kantorovich" or "Wasserstein") distance at a rate of $O\left( \frac{\sqrt{d} β\log n}{\sqrt{n}} \right)$, improving a result of Valiant and Valiant. The main feature of our theorem is that the rate of convergence is within $\log n$ of optimal for $n, d \rightarrow \infty$.

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