# chi-square

[kahy-skwair]

- 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

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## Examples from the Web for chi-square

### Historical Examples

#### The significance of each difference reported was calculated by the Chi-square test and the confidence limit is given in each case.

#### 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 CockroachesLouis M. Roth

# chi-square

- 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

[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.