when does a linear interaction need quadratic terms what does linear interaction mean why is the linear interaction between the predictors important? why does my linear model need quadratic interaction which term describes an interaction between the two continuous predictors? which two factors are included in a linear interaction? should you include quadratic if linear interaction how is a quadratic interaction performed in a linear model why does linear interaction have quadratic interaction when you have a linear interaction between two continuous predictors, you are why are quadratic coefficients important to linear models? how to find the relationship between a linear interaction and a quadratic interaction why do you need to include continuous interaction in r what is an interaction term can linear interactions be quadratic what is meant by linear interaction term and quadratic interaction term why do linear interaction terms have quadratic effects what is quadratic interaction when to include a linear interaction with a quadratic predictor how to use a linear interaction term r