That's got the lowest possible standard deviation of expected return and that's 25% stocks and 75% bonds with this sample period.

这个组合预期回报的标准差最小,在这一点上，投资组合,由25%的股票和75%的债券构成。

耶鲁公开课 - 金融市场课程节选

That means--his calculations are very different than the ones I have because he has a much longer sample period.

那表明。。。他的计算结果与我的大相径庭,因为它数据的取样跨度比我的长多了。

耶鲁公开课 - 金融市场课程节选

That's what I got using this sample period.

这就是用这个取样期间的数据得出的结果。

耶鲁公开课 - 金融市场课程节选

They might say my sample period was off, ... but that's what the theory-- ... using my data for the sample period that I computed-- the expected returns and co-variances says one should do.

他们可能说我的采样周期是有问题的，不过我的结果都是靠理论-,我采用自己收集的数据计算出-,预期收益和协方差可以用来指导我们的投资行为。

耶鲁公开课 - 金融市场课程节选