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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 Nelson–Aalen estimator ： ウィキペディア英語版 Nelson–Aalen estimator The Nelson–Aalen estimator is a non-parametric estimator of the cumulative hazard rate function in case of censored data or incomplete data. It is used in survival theory, reliability engineering and life insurance to estimate the cumulative number of expected events. An "event" can be the failure of a non-repairable component, the death of a human being, or any occurrence for which the experimental unit remains in the "failed" state (e.g., death) from the point at which it changed on. The estimator is given by :$\backslash tilde(t)=\backslash sum\_\backslash frac,$ with $d\_i$ the number of events at $t\_i$ and $n\_i$ the total individuals at risk at $t\_i$. The curvature of the Nelson–Aalen estimator gives an idea of the hazard rate shape. A concave shape is an indicator for infant mortality while a convex shape indicates wear out mortality. It can be used for example when testing the homogeneity of Poisson processes. ==See also== * Kaplan–Meier estimator 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「Nelson–Aalen estimator」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.