[R] Forecast
1stone
p.debski at gmx.net
Thu May 31 17:56:35 CEST 2012
#---------------------------------------------------------------------------------------------------------
USDEUR.xts<-xts(USDEUR[,2:3], # columns with data
USDEUR$Date) # column with date/time index
USDEUR_sample.xts<-window(USDEUR.xts,end=as.Date("2012-03-25"))
nobs<-length(USDEUR_sample.xts$Value)
arima111_2<-arima(USDEUR_sample.xts$Value, # variable
order=c(1,1,1), # (p,d,q) parameters
xreg=1:nobs # additional regressors - here: linear trend
)
fore_111 <- predict(arima111_2, n.ahead=5,
newxreg=(nobs+1):(nobs+5)) # using xreg in model
estimation
#---------------------------------------------------------------------------------------------------------
Problem is that forecast starts at 1184. But my sample ends at 169. I would
like to let start the forecast at 170, but I have no idea where to change
this detail in the above code. Any idea?
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