chi-square

American

[kahy-skwair] / ˈkaɪˌskwɛər /

noun

Statistics.

a quantity equal to the summation over all variables of the quotient of the square of the difference between the observed and expected values divided by the expected value of the variable.

chi-square Scientific

/ kī′skwâr′ /

A test statistic that is calculated as the sum of the squares of observed values minus expected values divided by the expected values.

Etymology

Origin of chi-square

First recorded in 1935–40

Example Sentences

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See Examples For:

chi-square

What is the chi-square test statistic and the p-value?

From Textbooks ● Mar. 27, 2020

You perform a chi-square goodness of fit test to see if this same proportion applies to your high school’s most recent graduating class of 200.

From Textbooks ● Sep. 19, 2013

The key characteristics of the chi-square distribution also depend directly on the degrees of freedom.

From Textbooks ● Sep. 19, 2013

The random variable in the chi-square distribution is the sum of squares of df standard normal variables, which must be independent.

From Textbooks ● Sep. 19, 2013

An important parameter in a chi-square distribution is the degrees of freedom df in a given problem.

From Textbooks ● Sep. 19, 2013

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023