A question about dummy variable

[eisamabodian]

Which of these forms is correct for a dummy variable?

Model A)

Code: Select all

1   :  T>=S
0   :   T<S

S=Structural break date


Model B)

Code: Select all

1   :  T>S
0   :   T<=S
S=Structural break date


[startz]

Either is fine. They differ in whether date T is on or off.

[eisamabodian]

Either is fine. They differ in whether date T is on or off.

What does mean on or off?

[startz]

Which side of the structural break do you want observation T to be in.

[eisamabodian]

Which side of the structural break do you want observation T to be in.

Is this arbitrary ?
Can we use both of this forms in empirical works?
Because in some papers I see Model A , while in others I see Model B.Is the result is the same in both of these situations or is different?