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{{Wiktionary|polykay}}
In [[statistics]], a '''polykay''', or '''generalised k-statistic''', (denoted <math>k_{r,s}</math>) is a statistic defined as a [[linear combination]] of [[sample moment]]s.<ref>{{cite web|url=http://mathworld.wolfram.com/Polykay.html|title=Polykay|publisher=Wolfram}}</ref>

==Etymology==
The word ''polykay'' was coined by [[Americans|American]] mathematician [[John Tukey]] in 1956, from ''poly'', "many" or "much", and ''kay'', the phonetic spelling of the letter "k", as in [[k-statistic]].<ref>Tukey, J. W. (1956.) "Keeping Moment-Like Computations Simple", ''Ann. Math. Stat.'', 27:37–54.</ref>

==References==
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[[Category:Symmetric functions]]
[[Category:Statistical inference]]