how to interpret interaction in multilevel modeling if an interaction is linear and does not have a quadratic slope why do i need to use linear slope instead of quadratic slope what is quadratic and linear slope what are interaction terms in the multilevel model why do not add quadratic slope in linear slope models? when removing interactions from a model, what is the significance of the linear and quadratic slope which interaction term is non-significant and which is significant when deleted why do you delete interactions from your multilevel model which interaction term is deleted from all interaction terms? can a linear interaction be considered a quadratic interaction how to interpret interaction effects can you delete an interaction from the model why delete non-significant interactions in a modeling interplay in a multilevel model when to remove nonsignificant interactions from model why does linear slope and quadratic slope interact in multiple model what is the difference between a linear slope and a quadratic how to interpret interplay terms in a multilevel model why do i delete interactivity from my model