Hello Statalist, I hope everyone is fine.

In my event study, I have event variable (EV) contain 1100 events for a panel dataset

I set event_window 10 days before and after the announcement day (EV date)

EV is a continuous variable and it's values are positive and negative

Specifically, 700 EV = positive values and 400 = negative values

my dependent variable is Y and independent variable is X,

The Y and X values only exist on the event_window dates (which is 10 days before and after EV)

my query is: I want to split my dependent variable (Y) into Yp and Yn

Yp = if EV is positive, then consider Y and X values all firm-year observation of a panel dataset for that event_window (10 days before and after dates of EV)

Yn = similar treatment as Yp but for negative values of EV

Thanks