tfarima (version 0.3.2)

roots: Roots of the lag polynomials of an ARIMA model

Description

roots compute the roots of the AR, I, MA lag polynomials an ARIMA model.

Usage

roots(x, ...)
# S3 method for um
roots(x, opr = c("arma", "ar", "ma", "i", "arima"), ...)

Arguments

x

an object of class um.

...

additional arguments.

opr

character that indicates which operators are selected.

Value

List of matrices with the roots of each single polynomial.

Examples

# NOT RUN {
um1 <- um(ar = "(1 - 0.8B)(1 - 0.8B^12)")
roots(um1)
# }