predict.HoltWinters          package:stats          R Documentation

prediction function for fitted Holt-Winters models

Description:

     Computes predictions and prediction intervals for models fitted by
     the Holt-Winters method.

Usage:

     ## S3 method for class 'HoltWinters':
     predict(object, n.ahead=1, prediction.interval = FALSE,
            level = 0.95, ...)

Arguments:

  object: An object of class 'HoltWinters'.

 n.ahead: Number of future periods to predict.

prediction.interval: 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.

Author(s):

     David Meyer David.Meyer@wu-wien.ac.at

References:

     C. C. Holt (1957) Forecasting seasonals and trends by
     exponentially weighted moving averages, ONR Research Memorandum,
     Carnigie Institute 52.

     P. R. Winters (1960) Forecasting sales by exponentially weighted
     moving averages, _Management Science_ *6*, 324-342.

See Also:

     'HoltWinters'

Examples:

     require(graphics)

     m <- HoltWinters(co2)
     p <- predict(m, 50, prediction.interval = TRUE)
     plot(m, p)

