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Posted: **Thu Dec 10, 2015 12:47 am**

What is algebraic form of D(Y,2,12)?
Is it Y(t)-2Y(t-1)+Y(t-2) or Y(t)-Y(t-1)-Y(t-12)+Y(t-13)?

Posted: **Fri Dec 11, 2015 7:20 am**

Neither. The resulting form will depend on how you expand/simplify it, but you can work on the following:

d(y,2,12) = (d(y)-d(y(-12)))-(d(y(-1))-d(y(-13)))

Meaning of D(Y,2,12)