roots | R Documentation |

`roots`

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

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

`x` |
an object of class |

`...` |
additional arguments. |

`opr` |
character that indicates which operators are selected. |

List of matrices with the roots of each single polynomial.

um1 <- um(ar = "(1 - 0.8B)(1 - 0.8B^12)") roots(um1)

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