Determination of the Influence of Fuel Switching Regulation on the Sulfur Dioxide Content of Air in a Port Area Using DID Model

Table 1

DID model parameters.

	No ship movement in or out of the dock (dt = 0)	Movement of ship(s) in or out of the dock (dt = 1)	Difference
Downwind (treatment group, du = 1)	α0 + α1	α0 + α1 + α2 + α3	ΔY = α2 + α3
No downwind (control group, du = 0)	α0	α0 + α2	ΔY = α2
DID model estimation	α1	α1 + α3	ΔY = α3