forecast (version 6.2)

plot.Arima: Plot characteristic roots from ARIMA model

Description

Produces a plot of the inverse AR and MA roots of an ARIMA model. Inverse roots outside the unit circle are shown in red.

Usage

## S3 method for class 'Arima':
plot(x, type=c("both","ar","ma"), 
  main, xlab="Real", ylab="Imaginary", ...)
## S3 method for class 'ar':
plot(x, main, xlab="Real", ylab="Imaginary", ...)

Arguments

x

Object of class Arima or ar.

type

Determines if both AR and MA roots are plotted, of if just one set is plotted.

main

Main title. Default is "Inverse AR roots" or "Inverse MA roots".

xlab

X-axis label.

ylab

Y-axis label.

...

Other plotting parameters passed to par.

Value

• None. Function produces a plot

See Also

Arima, ar

Examples

fit <- Arima(WWWusage, order=c(3,1,0))
plot(fit)

fit <- Arima(woolyrnq,order=c(2,0,0),seasonal=c(2,1,1))
plot(fit)

plot(ar.ols(gold[1:61]))