I have the following model:
m1.dis=arima(diff(diff(log(ts1),lag=12)),order=c(0,1,1),seasonal=list(order=c(0,1,1),period=12))
I would like to know how to plot the correct predictions in the original units
because I am trying the following code but it is not working.
I believe that there must be
You appear to be doing the differencing twice. Do it only in arima, and
not in the data you supply.
On Thu, 15 May 2008, Habib, Mohamed A F A M wrote:
I have the following model:
m1.dis=arima(diff(diff(log(ts1),lag=12)),order=c(0,1,1),seasonal=list(order=c(0,1,1),period=12))
I would like
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