yangwanqian 发表于 2015-4-12 15:09 
Risk Premiums in Dynamic Term Structure Mogels with Unspanned Macro Risks (Joslin 2013)
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span的原意指横跨,原文第一段是这样说的:"。。。is that the macro factors that determine bond prices are fully spanned by the current yield curve. That is, the affine mapping between bond yields and the risks in the macroeconomy in these models can be inverted to express these risk factors as linear combinations of yields."
我认为span可以翻作解释,“那些宏观风险被收益率曲线所完全解释了。也即是说,债券收益率和宏观风险之间的映射可以反过来用收益率的线性组合来表达这些宏观因素”。 所以我的理解unspanned macro risk的意思是“不能被对冲/解释的宏观风险”。你觉得呢?