@cache_readonly
    def mafreq(self):
        """
        (array) Frequency of the roots of the reduced form moving average
        lag polynomial
        """
        z = self.maroots
        if not z.size:
            return
        return (2 * np.pi) / np.arctan2(z.imag, z.real)
dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/tsa/statespace/sarimax.py/SARIMAXResults.mafreq/swapped operands of `/`