chi-square

noun, often attributive
\ˈkī-ˈskwer \

Definition of chi-square 

: a statistic that is a sum of terms each of which is a quotient obtained by dividing the square of the difference between the observed and theoretical values of a quantity by the theoretical value

First Known Use of chi-square

1900, in the meaning defined above

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The first known use of chi-square was in 1900

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