tsa
statsmodels.tsa.arima_process.
lpol2index
Remove zeros from lag polynomial
ar : array_like
coefficients of lag polynomial
coeffs : array
non-zero coefficients of lag polynomial
index : array
index (lags) of lag polynomial with non-zero elements
statsmodels.tsa.arima_process.index2lpol
statsmodels.tsa.arima_process.lpol_fiar