01-28-2016 07:11 PM
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.
01-28-2016 08:19 PM
01-28-2016 11:09 PM
Do it in one step with correlated sub-queries:
proc sql; create table medianSales as select firm, ( select median(sales) from have where firm=a.firm and year between a.year-3 and a.year-1 ) as medianSalesBefore, ( select median(sales) from have where firm=a.firm and year between a.year+1 and a.year+5 ) as medianSalesAfter from have as a where flag; select * from medianSales; quit;
01-28-2016 11:10 PM
If you have SAS 9.4 - median function not valid in PROC SQL in earlier versions.
It won't generate an error, but it won't be the metric you expect.