meanf | R Documentation |
Returns forecasts and prediction intervals for an iid model applied to y.
meanf(
y,
h = 10,
level = c(80, 95),
fan = FALSE,
lambda = NULL,
biasadj = FALSE,
bootstrap = FALSE,
npaths = 5000,
x = y
)
y |
a numeric vector or time series of class |
h |
Number of periods for forecasting |
level |
Confidence levels for prediction intervals. |
fan |
If TRUE, level is set to seq(51,99,by=3). This is suitable for fan plots. |
lambda |
Box-Cox transformation parameter. If |
biasadj |
Use adjusted back-transformed mean for Box-Cox transformations. If transformed data is used to produce forecasts and fitted values, a regular back transformation will result in median forecasts. If biasadj is TRUE, an adjustment will be made to produce mean forecasts and fitted values. |
bootstrap |
If TRUE, use a bootstrap method to compute prediction intervals. Otherwise, assume a normal distribution. |
npaths |
Number of bootstrapped sample paths to use if |
x |
Deprecated. Included for backwards compatibility. |
The iid model is
Y_t=\mu + Z_t
where Z_t
is a normal iid error. Forecasts are given by
Y_n(h)=\mu
where \mu
is estimated by the sample mean.
An object of class "forecast
".
The function summary
is used to obtain and print a summary of the
results, while the function plot
produces a plot of the forecasts and
prediction intervals.
The generic accessor functions fitted.values
and residuals
extract useful features of the value returned by meanf
.
An object of class "forecast"
is a list containing at least the
following elements:
model |
A list containing information about the fitted model |
method |
The name of the forecasting method as a character string |
mean |
Point forecasts as a time series |
lower |
Lower limits for prediction intervals |
upper |
Upper limits for prediction intervals |
level |
The confidence values associated with the prediction intervals |
x |
The original time series
(either |
residuals |
Residuals from the fitted model. That is x minus fitted values. |
fitted |
Fitted values (one-step forecasts) |
Rob J Hyndman
rwf
nile.fcast <- meanf(Nile, h=10)
plot(nile.fcast)
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