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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Asymptotic distribution ： ウィキペディア英語版 Asymptotic distribution In mathematics and statistics, an asymptotic distribution is a distribution that is in a sense the "limiting" distribution of a sequence of distributions. One of the main uses of the idea of an asymptotic distribution is in providing approximations to the cumulative distribution functions of statistical estimators. ==Definition== A sequence of distributions corresponds to a sequence of random variables Zi for ''i'' = 1, 2, ... . In the simplest case, an asymptotic distribution exists if the probability distribution of Zi converges to a probability distribution (the asymptotic distribution) as ''i'' increases: see convergence in distribution. A special case of an asymptotic distribution is when the sequence of random variables always approaches zero—that is, the Zi go to 0 as i goes to infinity. Here the asymptotic distribution is a degenerate distribution, corresponding to the value zero. However, the most usual sense in which the term asymptotic distribution is used arises where the random variables Zi are modified by two sequences of non-random values. Thus if :$Y\_i=\backslash frac$ converges in distribution to a non-degenerate distribution for two sequences and then Zi is said to have that distribution as its asymptotic distribution. If the distribution function of the asymptotic distribution is ''F'' then, for large ''n'', the following approximations hold :$P\backslash left(\backslash frac\; \backslash le\; x\; \backslash right)\; \backslash approx\; F(x)\; ,$ :$P(Z\_n\; \backslash le\; z)\; \backslash approx\; F\backslash left(\backslash frac\backslash right)\; .$ If an asymptotic distribution exists, it is not necessarily true that any one outcome of the sequence of random variables is a convergent sequence of numbers. It is the sequence of probability distributions that converges. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Asymptotic distribution」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.