Hi users.
I'm new user in R.
I'm workiing with Time series and I would like to know how can I do to undo
the command DIFF(X), for exemple:
If I have the model: m=arima(X, order=c(0,1,1),
seasonal=list(order=c(0,0,1))) (note that have d=1 one difference), to find,
in the same scale, the original numbers (like one "unDiff"), after the
forecast, I need to develop some function or in R there is some command
ready or function?
Thanks
Flávio
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