@property
    def isinvertible(self):
        '''Arma process is invertible if MA roots are outside unit circle

        Returns
        -------
        isinvertible : boolean
             True if moving average roots are outside unit circle
        '''
        if np.all(np.abs(self.maroots) > 1):
            return True
        else:
            return False
dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/tsa/arima_process.py/ArmaProcess.isinvertible/original