...When we have such an F ( x ), we define a set function Φ( I ) = F ( b ) - F ( a ) for the interval I = ( a , b ], and extend this to a measure on the real number R , which is called the distribution of X , or the probability distribution. Conversely, when a measure on R where Φ( R ) = 1, i.e., a probability measure, is given, the distribution function F ( x ) = Φ((-∞, x ] ) uniquely corresponds to it, which is the distribution function of a certain random variable. Any distribution function F(x) can always be decomposed as F(x) = a1F1 ( x ) + a2F2 ( x ) + a3F3 ( x ) , where a1 , a2 , a3 ≧ 0 , a1 + a2 + a3 = 1 .... *Some of the terminology explanations that mention "probability measure" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…このようなF(x)があるとき,区間I=(a,b]に対して集合関数Φ(I)=F(b)-F(a)を定め,これを実数R上の測度にまで拡張したものをXの分布,または確率分布という。逆に,R上のΦ(R)=1である測度,すなわち確率測度が与えられると,分布関数F(x)=Φ((-∞,x])が一意的に対応し,それはある確率変数の分布関数となる。任意の分布関数F(x)はつねにF(x)=a1F1(x)+a2F2(x)+a3F3(x),a1,a2,a3≧0,a1+a2+a3=1と分解される。… ※「確率測度」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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