Term: Likelihood Ratio Test (LRT)

Glossary Definition

Last Updated: 2007-10-20


As the name implies, the likelihood ratio is a ratio of two likelihoods. It is widely used as a test statistic, perhaps especially for relations among categorical variables displayed in contingency tables. The smaller the LR, the stronger the relationship. This is because (in comparison with the chi-square method) with the LR we attempt to accept a particular model, not reject a null hypothesis.

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