A chi-square (χ2) statistic is a test that is used to measure how expectations compare to actual observed data or model results.

Example 28.2: Computing Chi-square Tests for One-Way Frequency Tables This example examines whether the children's hair color (from Example 28.1) has a specified multinomial distribution for the two ...

The classical chi-square test for independence in a two-way contingency table often rejects the independence hypothesis at an extremely small significance level, particularly when the sample size is ...