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This is probably a stupid question...

I know that d(x) calculates the first difference, i.e. x - x(-1), but how do I find the difference in the previous period, i.e. x(-1) - x(-2)? Is it just d(x(-1))?

Thanks!
Charlie

what previous period. dont get it

d(X(-1)) = X(-1) - X(-2)

so yeah.

Brilliant, thanks!