Dictionary.com
Thesaurus.com

chi-square

American  
[kahy-skwair] / ˈkaɪˌskwɛər /

noun

Statistics.

  1. 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′ /

  1. 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

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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

From Textbooks • Sep. 19, 2013

For a chi-square distribution with 92 degrees of freedom, the curve .

From Textbooks • Sep. 19, 2013

Go to Appendix E for the chi-square solution sheet.

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

Test statistics based on the chi-square distribution are always greater than or equal to zero.

From Textbooks • Sep. 19, 2013

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

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.