Polykay
{{Wiktionary|polykay}}
In statistics, a polykay, or generalised k-statistic, (denoted ) is a statistic defined as a linear combination of sample moments.{{cite web|url=http://mathworld.wolfram.com/Polykay.html|title=Polykay|publisher=Wolfram}}
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.