来自《耶鲁大学开放课程：金融市场 第2集 第2集》

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  but beta of the stock is a measure of
  beta用以衡量
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  how much it moves with the market
  本公司跟随市场变化的程度
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  and the alpha of a stock is how much it outperforms the market.
  alpha衡量超过市场的表现
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  We'll have to come back to that--these are basic concepts.
  让我们回到这些基本的概念来
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  I want to--another concept--
  另一个概念...
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  I guess I've just been implicit in what I have--
  刚才这些我都讲明白了吧...
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  There's a distribution called the normal distribution
  有一个分布叫正态分布
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  and that is--I'm sure you've heard of this, right?
  大家有所耳闻吧
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  If you have a distribution that looks like this--
  大概是这样的一个分布
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  it's bell-shaped--this is x and--
  钟形的 这里是x
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  I have to make it look symmetric
  我要画的对称一点
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  which I may not be able to do that well--
  可能我画不好