Because the first time I wrote the program, I didn't have anything like that here and a stock could go to and then recover.

因为我第一次写这个程序的时候，我什么也没有,一只股票可以等于0然后再恢复。

麻省理工公开课 - 计算机科学及编程导论课程节选

We might or might not have time to come back to that But more generally, the point is, that each stock actually behaves a little bit differently.

我们可能没有时间讲这些问题了,但是一般来说，这里的问题是，每一只股票的表现,都是不一样的。

麻省理工公开课 - 计算机科学及编程导论课程节选

In '98, I forget which way, but one of the share classes 20% was at a 20% discount to the other and that persisted for several years, so you have economically identical things trading at different prices.

在98年，我不记得是为什么，一支这种类型的股票,比另一只股票便宜,而且这种现象持续了好几年的时间，因此你拥有经济意义上完全相同,但是却以不同价格进行交易的东西。

耶鲁公开课 - 金融市场课程节选

And when I ran that it, I got weird results, 300 because we know that a Google priced at, say, 300, is much more likely to move by 10 points in a day than a stock that's priced at $0.50.

当运行这个程序的时我得到很奇怪的答案，因为我们知道一只谷歌的股价大概是，对一个0。5美元的股票来讲,每天改变10个点才比较正常。

麻省理工公开课 - 计算机科学及编程导论课程节选

of a stock is how much it reacts to movements in the market portfolio.

一只股票风险指标β系数直接反应出，The，β,市场组合变动与投资收益的相关性。

耶鲁公开课 - 金融市场课程节选