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ARMAROOTS: Stata module to compute roots of AR- and MA-polynomials


  • Sune Karlsson

    () (Örebro University, Sweden)


armaroots is for use after arima. It calculates the roots of the characteristic polynomials (which should be less than 1 in modulus for stationarity and invertibility). For complex roots the period of the corresponding cycle is also calculated. The roots are plotted on the unit circle for easy visual checking for roots that cancel in the AR- and MA-polynomials.

Suggested Citation

  • Sune Karlsson, 2008. "ARMAROOTS: Stata module to compute roots of AR- and MA-polynomials," Statistical Software Components S456924, Boston College Department of Economics.
  • Handle: RePEc:boc:bocode:s456924 Note: This module should be installed from within Stata by typing "ssc install armaroots". Windows users should not attempt to download these files with a web browser.

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    ARIMA; stability; stationarity; invertibility;


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