The UE Abs∗Groupn interactions estimate the group-specific relations be- tween Abn Vol and earnings surprises. The UE Abs∗YearQtrq interactions al- low the relation between Abn Vol and earnings surprises to vary by quarter. Interactions between Ret Abs and each of Groupn and YearQtrq perform sim- ilar functions.19 UE Abs and Ret Abs are de-meaned so that main effects of interacted variables can be interpreted at the sample averages.