plot.ACF {nlme}  R Documentation 
an xyplot
of the autocorrelations versus the lags, with
type = "h"
, is produced. If alpha > 0
, curves
representing the critical limits for a twosided test of level
alpha
for the autocorrelations are added to the plot.
## S3 method for class 'ACF': plot(x, alpha, xlab, ylab, grid, ...)
x 
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 yaxis
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. 
an xyplot
Trellis plot.
Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates bates@stat.wisc.edu
fm1 < lme(follicles ~ sin(2*pi*Time) + cos(2*pi*Time), Ovary) plot(ACF(fm1, maxLag = 10), alpha = 0.01)