when is the interaction term important in cox regression why use interaction term should cox regression keep interaction term should interaction term be kept in a regression model? why should we retain interaction terms why do we keep interaction term when to use interaction term in regression analysis when to keep interaction term in regression how many variables are in a cox regression model why do you keep the interaction term in the cox regression when evaluating cox regression, how many variables are considered significant? should the interaction term be retained in model should interaction terms be used in cox regression when to keep an interaction term should i keep interaction terms how long should an interaction term be in a mortality model which of these interaction terms in the mri model is significant why should you use interaction term for a model what is an interaction term should the interaction term be kept