云同学2018-02-27 17:06:44
老师,38题是哪里的知识点,都看不懂答案解释
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Wendy2018-02-27 17:42:44
同学你好,这个内容讲义上没具体涉及,我整体做一下介绍,字数比较多:
1.Introduction
Mean reversion is the tendency of a variable to be pulled back to its long-term mean.
【Definition】
In finance, many variables, such as bonds, interest rates, volatilities, credit spreads, and more, are assumed to exhibit mean reversion.
【Bonds, interest rates, volatilities, credit spreads等都存在mean reversion】
Fixed coupon bonds, which do not default, exhibit strong mean reversion: A bond is typically issued at par, for example at $100. If the bond does not default, at maturity it will revert to exactly that price of $100, which is typically close to its long-term mean.
【债券价格在不违约的情况在到期会趋向于par value,也就是一级估值中学的“pull to par”,那么在此处,par value就相当于债券价格的长期均值】
【经济扩张时,由于投资需求增长会抬高利率。高利率会使得过热的经济平静,使得投资需求下降,利率下降,回落至长期均值甚至低于长期均值。在经济萧条或者经济复苏开始时,由于扩张货币政策和财政政策作用,重新拉动投资需求,从而抬升利率回归至均值】
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谢谢老师,不过能讲讲题目里面的回归公式吗,为什么均值回归系数是0.75?0.215又代表什么?
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