Contrast (statistics)

In statistics, a "contrast" refers to a specific type of linear combination of group means or regression coefficients that is used to make inferences about the differences between groups or the effects of variables. Contrasts are particularly useful in the context of experimental design and analysis of variance (ANOVA), where researchers often want to compare specific conditions or treatments. ### Key Concepts: 1. **Linear Combination**: A contrast is typically expressed as a linear combination of group means.