predict.HoltWinters
Prediction Function for Fitted Holt-Winters Models
Computes predictions and prediction intervals for models fitted by the Holt-Winters method.
- Keywords
- ts
Usage
# S3 method for 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.
References
C. C. Holt (1957) Forecasting trends and seasonals by exponentially weighted moving averages, ONR Research Memorandum, Carnegie Institute of Technology 52.
P. R. Winters (1960). Forecasting sales by exponentially weighted moving averages. Management Science, 6, 324--342. 10.1287/mnsc.6.3.324.
See Also
Examples
library(stats)
# NOT RUN {
require(graphics)
m <- HoltWinters(co2)
p <- predict(m, 50, prediction.interval = TRUE)
plot(m, p)
# }