statsmodels.tsa.arima_process.lpol_fima

statsmodels.tsa.arima_process.lpol_fima(d, n=20)[source]

MA representation of fractional integration

\[(1-L)^{-d} for |d|<0.5 or |d|<1 (?)\]
Parameters

d : float

fractional power

n : int

number of terms to calculate, including lag zero

Returns

ma : ndarray

coefficients of lag polynomial