statsmodels.sandbox.tsa.fftarma.ArmaFft.arma2ar¶ ArmaFft.arma2ar(lags=None)¶ A finite-lag AR approximation of an ARMA process. Parameters: lagsintThe number of coefficients to calculate. Returns: ndarrayThe coefficients of AR lag polynomial with nobs elements. Notes Equivalent to arma_impulse_response(ma, ar, leads=100)