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05 Uniform Laws of Large Numbers

05 Uniform Laws of Large Numbers

作者: 顾劝劝 | 来源:发表于2021-07-09 15:30 被阅读0次

    本章提要:

    • Uniform laws of large numbers
    • argmax theorem
    • covering and bracketing numbers
    • metric entropy

    ULLN

    对于P,\mathcal F满足ULLN,如果:
    || P_n-P ||_{\mathcal F}:=\sup_{f\in\mathcal F}| P_nf - Pf| \xrightarrow{p} 0.

    举个满足ULLN的例子:

    Glivenko Cantelli定理

    \mathcal F=\{f(x)=1\{x\leq t\}\}_{t\in\mathbb R}
    \sup_{f\in\mathcal F}| P_nf - Pf|=\sup_{t\in\mathbb R}|P_n(X\leq t)-P(x\leq t) |\xrightarrow{p}0

    ULLN可以使得一致性的证明变得非常简单

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