Editing Nonparametric statistics (section)

==History==
Early nonparametric statistics include the [[median]] (13th century or earlier, use in estimation by [[Edward Wright (mathematician)|Edward Wright]], 1599; see {{slink|Median|History}}) and the [[sign test]] by [[John Arbuthnot]] (1710) in analyzing the [[human sex ratio]] at birth (see {{slink|Sign test|History}}).<ref name="Conover1999">{{Citation
|last=Conover
|first=W.J.
|title=Practical Nonparametric Statistics
|edition=Third
|year=1999
|publisher=Wiley
|isbn=0-471-16068-7
|pages=157–176
|chapter=Chapter 3.4: The Sign Test
}}</ref><ref name="Sprent1989">{{Citation
|last=Sprent
|first=P.
|title=Applied Nonparametric Statistical Methods
|edition=Second
|year=1989
|publisher=Chapman & Hall
|isbn=0-412-44980-3
}}</ref>