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polykay
In statistics, a polykay, or generalised k-statistic, (denoted ) is a statistic defined as a linear combination of sample moments.〔(【引用サイトリンク】title=Polykay )〕 ==Etymology== The word ''polykay'' was coined by American mathematician John Tukey in 1956, from ''poly'', "many" or "much", and ''kay'', the phonetic spelling of the letter "k", as in k-statistic.〔Tukey, J. W. (1956.) "Keeping Moment-Like Computations Simple", ''Ann. Math. Stat.'', 27:37–54.〕
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