Fri 8 Mar, 2019 07:54 pm
Let's say you are conducting a multiple regression analysis examining the impact of X1 on Y. Let's also say you do not find a relationship until you control for X2. After controlling for X2, X1 predicts Y. Am I correct in assuming that this is an example of a suppression effect? If not, what is the name for this effect? What exactly has happened here?