what happens if the interactions are missing in a regression model when does a main effect change how to figure out if a major effect is a main effect is it a main effect when the interaction is not significant? when is a main effect significant what step of regression do you find the main effect of an interaction is it important if interaction is included in the main effect of a regression model what if an interaction wipes out my direct effects what is the main effect in the regression what is the difference between a main effect and interaction in a regression analysis if interaction wipes out the direct effects are it significant? what is main effect what is the main effect of regression? do they always have to be significant? why main effect is significant when is the main effect significant? what if the direct affect is not significant in step one when is the main effect significant what step in a regression model is a main effect significant is it a main effect when interaction is included in regression when is an interaction significant