what do interaction terms mean? what is the interaction of non spline terms what is the relationship between slope of y and slope of b? what's a spline interaction what is a b interaction in r what does an interaction coefficient of a spline mean? what is interaction of non spline terms what is the interaction term for r what is the difference between a and b what is the interaction of spline and non spline terms that r use to fit the data? i. what do non spline terms mean which of the following is an interaction r term what do spline terms mean what is the interaction term for a spline what is the relationship between slope and interaction coefficient if it is curvilinear what does the interaction term mean in r what does a interaction term for r mean what interaction term is used to measure vertical displacement of a spline what is the interaction term of a r graph what does a b mean in r