loveshihongyu2020-03-16 12:49:44
老师您好, 您能帮我再解释一下这句话吗?为什么OMS 没有考虑到credit spread volatility呢?谢谢!
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Chris Lan2020-03-16 14:09:56
同学你好
原版书有个例子,意思是两个组合有相同的平均OAS,但sensitive可能是不同的。
Average OAS is a reasonable representation of portfolio credit quality, but it does not fully account for the risk of credit spread volatility. For example, a portfolio composed of 30-year corporate bonds with an average OAS of 100 will be more sensitive to changes in credit spreads compared with a portfolio of two-year bonds having the same average OAS. A weighted-average spread duration can account for the risk of credit spread volatility.
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不好意思, 老师。 我还是不太懂, 能不能用白话再讲解一下吗?
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同学你好
原版书这段话,说的是does not fully account for the risk of credit spread volatility
不是完全不能衡量,而是衡量的不全。
书上举了一个例子说,有两个组合它们的average OAS都是100,但是他们对于信用利差风险的敏感程度可能是不同的,也就是信用利差变化,对这两个average OAS都是100的组合的影响程度可能是不同的,所以当credit spread volitility时,不能很好的衡量这种风险。
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