MA representation of fractional integration
(1-L)^{-d} for |d|<0.5 or |d|<1 (?)
d : float
fractional power
n : int
number of terms to calculate, including lag zero
ma : array
coefficients of lag polynomial
statsmodels.tsa.arima_process.lpol_fiar
statsmodels.tsa.arima_process.lpol_sdiff
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