@property
    def isstationary(self):
        '''Arma process is stationary if AR roots are outside unit circle

        Returns
        -------
        isstationary : boolean
             True if autoregressive roots are outside unit circle
        '''
        if np.all(1 > np.abs(self.arroots)):
            return True
        else:
            return False
dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/tsa/arima_process.py/ArmaProcess.isstationary/swapped operands of `>`