Exploring interactions: continous and categorical (4 levels)
Hi all! I really need some help. How can I test a significant interaction between a continuous and categorical variable? I ran a linear mixed model with continuous dependent (e.g. engagement), fixed effects "compulsive buying-score", advertising category (4 categories) and their interaction, and random effects "Subject ID" and "StimuliName" . The interaction between "compulsive buying-score" and ...