Hi.

I hope you can help me...

 

I have fitted the following ARIMA model:
arima1<-arima(bigspring$log.volume, order=c(0,1,2))

I need to predict 30 days ahead.  I used following code
predict(arima1,n.ahead=30,se=T)

 

However I get 30 predictions, but from predictions 2:30 I get the same
predictions.  Why is this?  What am I doing wrong

 

Thanks

Catherine



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