The chi-squared test, often written as χ2 test, is a statistical hypothesis test used in the analysis of categorical variables to determine whether observed data are different from expectations. In ...

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

A statistical test that allows one to determine whether observed quantities of a specific characteristic differed from the expected value purely by chance.

A rigorous method of utilizing information from a previous study when determining the sample size for a chi-squared test is outlined. The approach is able to guarantee that the average power of all ...