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

When does the chi-square curve approximate a normal distribution?

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 test statistic and the p-value.

From Textbooks • Sep. 19, 2013

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

From Textbooks • Sep. 19, 2013