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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 Zero-inflated model ： ウィキペディア英語版 Zero-inflated model In statistics, a zero-inflated model is a statistical model based on a zero-inflated probability distribution, i.e. a distribution that allows for frequent zero-valued observations. ==Zero-inflated Poisson== The first zero-inflated model is zero-inflated Poisson model. The zero-inflated Poisson model concerns a random event containing excess zero-count data in unit time. For example, the number of insurance claims within a population for a certain type of risk would be zero-inflated by those people who have not taken out insurance against the risk and thus are unable to claim. The zero-inflated Poisson (ZIP) model employs two components that correspond to two zero generating processes. The first process is governed by a binary distribution that generates structural zeros. The second process is governed by a Poisson distribution that generates counts, some of which may be zero. The two model components are described as follows: :$\backslash Pr\; (y\_j\; =\; 0)\; =\; \backslash pi\; +\; (1\; -\; \backslash pi)\; e^$ :$\backslash Pr\; (y\_j\; =\; h\_i)\; =\; (1\; -\; \backslash pi)\; \backslash frac\}\; ,\backslash qquad\; h\_i\; \backslash ge\; 1$ where the outcome variable $y\_j$ has any non-negative integer value, $\backslash lambda\_i$ is the expected Poisson count for the $i$th individual; $\backslash pi$ is the probability of extra zeros. The mean is $(1-\backslash pi)\; \backslash lambda$ and the variance is $\backslash lambda\; (1-\backslash pi)\; (1+\backslash lambda\; \backslash pi)$. 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「Zero-inflated model」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.