χ2 value

Definition

The χ2 value, also known as the chi-square value, is a statistical measure used in a chi-square test to determine if there is a significant relationship between two categorical variables. It quantifies the difference between the observed and expected frequencies.

Related terms

Degrees of Freedom: Represents the number of categories that can vary freely in a statistical analysis. In the context of chi-square tests, it refers to the number of categories minus 1.

Significance Level: The level at which we decide whether to reject or fail to reject the null hypothesis. Commonly denoted as α (alpha), it is typically set at 0.05.

Expected Frequencies: The frequencies that would be expected under the assumption that there is no association between two categorical variables being analyzed using a chi-square test. These values are calculated based on proportions or probabilities from theoretical distributions or previous data.