An odds ratio is a statistic that quantifies the relationship between two events, commonly used in case-control studies to compare the odds of an event occurring in two different groups. It expresses the odds of an outcome happening in the exposed group versus the odds of it happening in the unexposed group, providing insight into the strength and direction of an association. In contingency tables, odds ratios help to summarize the relationship between categorical variables, which is crucial for understanding interactions in log-linear models.
congrats on reading the definition of Odds Ratios. now let's actually learn it.