logical. If TRUE, the lower and
upper bounds of the corresponding prediction intervals are computed.

level

Confidence level for the prediction interval.

…

arguments passed to or from other methods.

Value

A time series of the predicted values. If prediction intervals are
requested, a multiple time series is returned with columns fit,
lwr and upr for the predicted values and the lower and
upper bounds respectively.

References

C. C. Holt (1957)
Forecasting trends and seasonals by exponentially weighted
moving averages,
ONR Research Memorandum, Carnegie Institute of Technology52.

P. R. Winters (1960).
Forecasting sales by exponentially weighted moving averages.
Management Science, 6, 324--342.
10.1287/mnsc.6.3.324.