what is the main interaction of year in linear models how to compute an interaction estimate in a model how to compute main effect of an association in r? when is the main effect of year significant in r? how do i compute the difference between the main effect and the main effect of year? what is the main effect of year in r how to estimate the main interaction in r how to calculate the main effect of a linear model which linear model is significant when the main interaction is not significant when is the main effect of the year of the linear model not significant which of the following is a linear model that shows a difference between a linear relationship and a dependent variable how to estimate the main effect of year in a linear model when is a linear r interaction significant how to compute a significant interaction when main effect is not associated with a dependent variable when is an interaction significant how does a linear model work with an interaction variable in r when is the main effect of year significant?? what is the difference between the main effect and the main interaction how do you compute significant interaction