Plot a raw time series together with it's fitted curve and add forecasts and prediction intervals to the end.
forecastplot(x, ...)Called for the side effect of drawing a plot.
The constructed ggplot object is returned invisibly.
iNZightTS object
additional arguments passed on
The predictions and prediction intervals are the result of models
fitted by the Holt-Winters method. The amount of predicted
observations is calculated by 2 * freq, where freq is
the frequency of the time series object.