来自《耶鲁大学开放课程：金融市场 第4集 第4集》

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  and that portfolio had a much higher
  这个投资组合的平均收益率
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  average return or expected return--13%--
  或者说预期收益率要高得多 大概13%
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  but it also had a much higher standard deviation of return--
  但同时它的标准差也高得多
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  it was about 16%.
  大约是16%
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  So, you can see that those are the two raw portfolios.
  这些都是两种单一资产的投资组合
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  That could be investor only in bonds or an investor only in stocks,
  表示投资者只投资了债券或者只投资了股票
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  but I also show on here
  同时我在这里也展示了
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  what some other returns are that are available.
  其它可能性组合的收益
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  The minimum variance portfolio is down here.
  风险最小的投资组合在这一点取到
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  That's got the lowest possible standard deviation
  这个组合预期回报的标准差最小
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  of expected return and that's 25% stocks
  在这一点上 投资组合
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  and 75% bonds with this sample period.
  由25%的股票和75%的债券构成