Calculate moving average bias ratio

def ma_bias_ratio(self, day1, day2):
        """Calculate moving average bias ratio"""
        data1 = self.moving_average(self.price, day1)
        data2 = self.moving_average(self.price, day2)
        result = [data1[-i] - data2[-i] for i in range(1, min(len(data1), len(data2)) + 1)]

        return result[::-1]