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If you're comparing two portfolios with the same expected return, then you want the one with the lower variance.
比较两个有相同预期收益率的投资组合时，你会选择方差小的那一个。
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Indexed portfolios, you basically say, I want to own all of the stocks that there are, and if the stock market goes up, I make money, if the stock market goes down, I lose money.
指数化资产组合，使之我拥有这些股票，如果股市走高，那么我就赚钱，如果股市走低我就赔钱。
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From then on,if you accept the analysis and the assumptions or the estimates that underlie it, then we pretty much know how to construct portfolios.
如果你们理解了整个分析过程,假设前提以及各项资产的有关估算,就能知道该怎样建立一个投资组合
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I can try other portfolios; this one right here--I'm pointing to a point on the pink line-- that point right there, 50% stocks, 50% bonds.
还可以尝试其它组合;,这一点，粉色曲线上我指的这一点-,表示50%的股票，50%的债券。
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Two tenets, an equity bias for portfolios with a long time horizon and diversification.
两个原则,长期投资中的股权偏好,以及分散投资
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There are a lot of human hardships that can be solved by diversifying portfolios.
很多生活上的困难,都可以通过分散投资来解决。
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Unencumbered by, I guess, the conventional wisdom, we started out at Yale on a path that I think is--fundamentally that changed the way that institutions manage portfolios.
抛开惯常思维和传统做法,我们在耶鲁开创了一条新路,一条我认为,从根本上,改变了机构投资管理方式的新路
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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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The first problem set asked you to manipulate the model that I just presented-- the model of how you form portfolios and the model of the capital asset pricing model.
第一道习题,考察的是你们能否活用我刚刚给出的几个模型-,包括怎样构成投资组合的模型,和资本资产定价模型。
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But ultimately, everyone agrees I-- that's the premise here, that for the-- if you're comparing two portfolios with the same variance, then you want the one with the higher expected return.
但归根结底大家都会同意这一点-,这是一个前提-,当你比较两个有相同方差的投资组合时，你会选择预期收益率高的那一个。
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These are people who manage portfolios.
他们管理金融系列服务
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Because we hold relatively stable, relatively well-diversified portfolios, security selection turns out not to be an important determinant of returns for most investors and market timing turns out not to be an important determinant of returns.
因为持有相对稳定,和相对分散的投资组合,证券选择不再是,决定投资者回报率的重要因素,而市场时机选择,也不会成为决定回报率的重要因素
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He's come to the conclusion that over 90% of the variability of returns in institutional portfolios is attributable to asset allocation and that's the number that I think most people hear cited when they are looking at Roger Ibbotson's work.
他得出结论,机构投资中,超过90%的回报率变动,要归因于资产配置,我想这是罗格·伊博森的文章里面,被人引用得最多的结论
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What we want to do now is compute the mean and variance of the portfolio-- or the mean and standard deviation, since standard deviation is the square root of the variance-- for different combinations of the portfolios.
我们现在要做的是,计算这个投资组合的均值和方差-,或者均值和标准差，因为标准差的平方就等于方差-,这对任何投资组合都是一样的。
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So 90% of your portfolio is in domestic marketable securities and only 10% is invested in things like real estate or venture capital or private equity -hardly enough to make a difference in terms of the portfolios returns.
于是90%的投资都在本国有价证券中,仅10%用于比如不动产,风险资本或私募股权投资,这一小块几乎对投资回报,没有什么作用
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