The General Linear Model (GLM)
The Common Foundation: The General Linear Model (GLM) First, it's crucial to understand that ANOVA, ANCOVA, and MANOVA are all part of the same family: the General Linear Model (GLM) . They all test for differences between group means, but they differ in the number and type of variables they can handle. Independent Variable(s): The grouping variable(s) (e.g., drug type, breed, diet). These are categorical (factors). Dependent Variable(s): The outcome you are measuring (e.g., weight gain, blood cell count, enzyme level). These are continuous. 1. ANOVA (Analysis of Variance) What it is: ANOVA is used to determine if there are any statistically significant differences between the means of three or more independent groups based on one continuous dependent variable . When to use it: You have one categorical independent variable (factor) with three or more levels . You have one continuous dependent variable. You wa...