Chi-square test of independence

Definition

A chi-square test of independence is a statistical test used to determine if there is a relationship between two categorical variables. It compares the observed frequencies in each category with the expected frequencies under the assumption that there is no association between the variables.

Related terms

Observed frequencies: The actual counts or numbers of individuals falling into each category for the variables being studied.

Expected frequencies: The counts or numbers that would be expected in each category if there was no association between the variables.

Categorical variables: Variables that represent qualitative characteristics rather than numerical values. They classify individuals or items into different groups based on certain attributes.