Plot an ACF Object
Usage
plot(object, alpha, xlab, ylab, grid, ...)
Arguments
object
|
an object inheriting from class ACF ,
consisting of a data frame with two columns named lag and
ACF , representing the autocorrelation values and the
corresponding lags.
|
alpha
|
an optional numeric value with the significance level for
testing if the autocorrelations are zero. Lines corresponding to the
lower and upper critical values for a test of level alpha are
added to the plot. Default is 0 , in which case no lines are
plotted.
|
xlab,ylab
|
optional character strings with the x- and y-axis
labels. Default respectively to "Lag" and
"Autocorrelation" .
|
grid
|
an optional logical value indicating whether a grid should
be added to plot. Default is FALSE .
|
...
|
optional arguments passed to the xyplot function.
|
Description
an xyplot
of the autocorrelations versus the lags, with
type = "h"
, is produced. If alpha > 0
, curves
representing the critical limits for a two-sided test of level
alpha
for the autocorrelations are added to the plot.Value
an xyplot
Trellis plot.Note
This function requires the trellis
library.Author(s)
Jose Pinheiro and Douglas BatesSee Also
ACF
, xyplot
Examples
library(lme)
data(Ovary)
# plot.ACF assigns with where = 1 (strange - should it be
frame = 1)
fm1 <- lme(follicles ~ sin(2*pi*Time) + cos(2*pi*Time), Ovary)
plot(ACF(fm1, maxLag = 10), alpha = 0.01)