statsmodels.tsa.arima_process.ArmaProcess.invertroots
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ArmaProcess.invertroots(retnew=False)
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make MA polynomial invertible by inverting roots inside unit circle
Parameters: retnew : boolean
If False (default), then return the lag-polynomial as array. If True, then return a new instance with invertible MA-polynomial
Returns: manew : array
new invertible MA lag-polynomial, returned if retnew is false.
wasinvertible : boolean
True if the MA lag-polynomial was already invertible, returned if retnew is false.
armaprocess : new instance of class
If retnew is true, then return a new instance with invertible MA-polynomial
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