我们可由与之Ljung-Box统计量是否显著来分别检定模型之期望值方程式(mean equation)与波动方程式(volatility equation)是否合适.
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volatility equation
波动方程
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But if you subtract nature's volatility from the equation, then these icy flowers are no longer guaranteed uniqueness.
但是如果你去除大自然的不确定性，那么这些冰冷的花朵就不再具有独特性。
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Add to the equation the high correlation in the stock market and high volatility, and suddenly the rule of thumb of investing 60% of your money in stocks and 40% in bonds no longer provides the returns they once did.
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