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

See Examples For:

chi-square

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

If the expected and observed values are not close together, then the test statistic is very large and way out in the right tail of the chi-square curve, as it is in a goodness-of-fit.

From Textbooks ● Sep. 19, 2013

What is the chi-square statistic and degrees of freedom for this study?

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