以下是引用水模样在2007-8-31 20:40:00的发言：还有一个我没懂，请教 book4,p105的9题的解释，最后说：the overall risk of the portfolio should decrease, resulting in a lower standard deviation. Does that mean low risk, low SD; high risk, high SD? [em09] sd result in risk,so we can only say that the higher sd, the higt risk. | 
发表于 2007-9-13 23:53
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