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In statistics, the Cunningham function or Pearson–Cunningham function ω''m'',''n''(''x'') is a generalisation of a special function introduced by and studied in the form here by . It can be defined in terms of the confluent hypergeometric function ''U'', by : The function was studied by Cunningham in the context of a multivariate generalisation of the Edgeworth expansion for approximating a probability density function based on its (joint) moments. In a more general context, the function is related to the solution of the constant-coefficient diffusion equation, in one or more dimensions.〔 The function ω''m'',''n''(''x'') is a solution of the differential equation for ''X'':〔 : The special function studied by Pearson is given, in his notation by,〔 : ==Notes== 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「Cunningham function」の詳細全文を読む スポンサード リンク
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