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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 Semivariance ： ウィキペディア英語版 Semivariance :''For the measure of downside risk, see Variance#Semivariance In spatial statistics, the empirical semivariance is described by :$\backslash hat\backslash gamma(h)=\backslash frac\backslash cdot\backslash frac\backslash sum\_^(z(x\_i+h)-z(x\_i))^2$ where ''z'' is a datum at a particular location, ''h'' is the distance between ordered data, and ''n''(''h'') is the number of paired data at a distance of ''h''. The semivariance is half the variance of the increments $z(x\_i+h)-z(x\_i)$, but the whole variance of z-values at given separation distance ''h'' (Bachmaier and Backes, 2008). A plot of semivariances versus distances between ordered data in a graph is known as a semivariogram rather than a variogram. Many authors call $2\backslash hat\backslash gamma(h)$ a variogram, others use the terms variogram and semivariogram synonymously. However, Bachmaier and Backes (2008), who discussed this confusion, have shown that $\backslash hat\backslash gamma(h)$ should be called a variogram, terms like semivariogram or semivariance should be avoided. ==See also== * Variance * Geostatistics * Kriging 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「Semivariance」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.