翻訳と辞書 Words near each other ・ K-class ferry ・ K-class sloop ・ K-class submarine ・ K-Club ・ K-Commando ・ K-Commerce ・ K-complex ・ K-convex function ・ K-d tree ・ K-D-B-tree ・ K-Day ・ K-Days ・ K-Dee ・ K-Def ・ K-Developedia ・ K-distribution ・ K-Dow Petrochemicals ・ K-Drama (rapper) ・ K-edge ・ K-edge-connected graph ・ K-Electric ・ K-Electric F.C. ・ K-epsilon turbulence model ・ K-equivalence ・ K-factor ・ K-factor (actuarial) ・ K-factor (aeronautics) ・ K-factor (Cisco) ・ K-factor (fire protection) ・ K-factor (marketing) Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク K-distribution ： ウィキペディア英語版 K-distribution In probability and statistics, the K-distribution is a three-parameter family of continuous probability distributions. The distribution arises by compounding two gamma distributions. In each case, a re-parametrization of the usual form of the family of gamma distributions is used, such that the parameters are: : *the mean of the distribution, and : *the usual shape parameter. ==Density== The model is that random variable $X$ has a gamma distribution with mean $\backslash sigma$ and shape parameter $L$, with $\backslash sigma$ being treated as a random variable having another gamma distribution, this time with mean $\backslash mu$ and shape parameter $\backslash nu$. The result is that $X$ has the following probability density function (pdf) for $x>0$:〔Redding (1999)〕 :$f\_X(x;\backslash mu,\backslash nu,L)=\; \backslash frac\}\; K\_\backslash alpha\; (\; 2\; \backslash sqrt),$ where $\backslash alpha\; =\; \backslash nu-L,$ $\backslash beta\; =\; L\; +\; \backslash nu\; -\; 1,$ $\backslash xi\; =\; L\backslash nu/\backslash mu\; ,$ and $K$ is a modified Bessel function of the second kind. In this derivation, the K-distribution is a compound probability distribution. It is also a product distribution:〔 it is the distribution of the product of two independent random variables, one having a gamma distribution with mean 1 and shape parameter $L$, the second having a gamma distribution with mean $\backslash mu$ and shape parameter $\backslash nu$. This distribution derives from a paper by Jakeman and Pusey (1978) who used it to model microwave sea echo. Jakeman and Tough (1987) derived the distribution from a biased random walk model. Ward (1981) derived the distribution from the product for two random variables, ''z'' = ''a'' ''y'', where ''a'' has a chi distribution and ''y'' a complex Gaussian distribution. The modulus of ''z'', ''|z|'', then has K distribution. 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「K-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.