plot.ACF {nlme} | R Documentation

## Plot an ACF Object

### 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.

### Usage

    ## S3 method for class 'ACF':
    plot(x, alpha, xlab, ylab, grid, ...)

### Arguments

`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 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.

### Value

an `xyplot` Trellis plot.

### Author(s)

Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates bates@stat.wisc.edu

### See Also

`ACF`, `xyplot`

### Examples

    data(Ovary)
    fm1 <- lme(follicles ~ sin(2*pi*Time) + cos(2*pi*Time), Ovary)
    plot(ACF(fm1, maxLag = 10), alpha = 0.01)

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