But, in recent years, Average Value Return Theory gave a challenge to the Random Walk Theory.

但是，近年来均值回归理论对随机漫步理论提出了挑战。

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Random Walk Theory thinks that the price of the shares is unpredictable, and many concrete examples have already proved this conclusion.

随机漫步理论认为股票的价格是不能预测的，许多实证检验的结果也支持了这一结论。

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Before you start importing and running the actual code, let me walk you through a little bit of theory.

在您开始导入并运行实际的代码前，让我来为您逐步地讲述一点点理论。

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Those who adhere to the random walk theory also point out that the timing of new data and news is unpredictable, and that stock prices react quickly to the introduction of new information.

FORBES: Are Stock Prices Random Or Chaotic?

Authors Guofo Zhou and Yingzi Zu use some complex math based on the random-walk theory to show that the odds of watching half your liquid net worth evaporate are roughly similar to those of another major life event: death.

FORBES: We Can't Avoid Another Market Crash

The simplest theory is that these swellings dwindled to nothing after our ancestors began to walk upright, because the costs of advertising ovulation in this way came to outweigh any benefits.

NEWYORKER: It Ain��t Necessarily So