tsa
statsmodels.tsa.arima_process.
index2lpol
Expand coefficients to lag poly
coeffs : array
non-zero coefficients of lag polynomial
index : array
index (lags) of lag polynomial with non-zero elements
ar : array_like
coefficients of lag polynomial
statsmodels.tsa.arima_process.deconvolve
statsmodels.tsa.arima_process.lpol2index