statsmodels.tsa.arima_process.index2lpol

statsmodels.tsa.arima_process.index2lpol(coeffs, index) [source]

Expand coefficients to lag poly

Parameters:	coeffs (array) – non-zero coefficients of lag polynomial index (array) – index (lags) of lag polynomial with non-zero elements
Returns:	ar – coefficients of lag polynomial
Return type:	array_like