statsmodels.sandbox.tsa.fftarma.ArmaFft.periodogram

ArmaFft.periodogram(nobs=None)

Periodogram for ARMA process given by lag-polynomials ar and ma.

Returns:

• w (ndarray) – The frequencies.

• sd (ndarray) – The periodogram, also known as the spectral density.

Notes

Normalization ?

This uses signal.freqz, which does not use fft. There is a fft version somewhere.