Dear SAS community users,   I have an unbalanced panel data set with firm years. In that set, I have a dummy marking an event year (year when new stock is issued). I want to find the median of a variable (sale, for example) 3 years before the event year for each firm ID. Then I want to find the median of the same variable 5 years after the event year for each firm ID.   I'd appreciate any help here. Thank you in advance.   Regards, Hinh ... View more