chi-square

[kahy-skwair]

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.

Origin of chi-square

First recorded in 1935–40

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for chi-square

Historical Examples of chi-square

The significance of each difference reported was calculated by the Chi-square test and the confidence limit is given in each case.
Subspeciation in the Meadow Mouse, Microtus pennsylvanicus, in Wyoming, Colorado, and Adjacent Areas
Sydney Anderson
In a fourfold table, the value of chi-square (14.7) is significant and indicates that the frequencies are not proportional.
The Biotic Associations of Cockroaches
Louis M. Roth

chi-square in Medicine

chi-square

n.

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

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

chi-square in Science

chi-square

[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.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.