Sophia_Li
2017-05-30 00:49請(qǐng)教老師這道題: Which of the following statements is most accurate regarding Diffle"s calculation of duration and convexity? A.The duration estimate will be inaccurate since it does not account for any change in cash flows due to the call option embedded in the Hardin bond. B.The duration estimate for the Bratton bonds will reflect the projected percentage change in price for a 100-basis-point change in interest rates. C.The estimates for both duration and convexity will be inaccurate because the OAS was not estimated again after the rate shock. 答案是B,不太理解。為什么不是C?記得周老師在百題課上講了二叉樹(shù)構(gòu)建的時(shí)候兩次調(diào)整的OAS是不一樣的。 (本題出處:Practice Exam 第2冊(cè) 第3套題上午 #42)
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1個(gè)回答
大鬼班主任
2017-05-31 15:26
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同學(xué)你好,首先要先理解OAS的概念,求OAS 是選一個(gè)benchmark,然后在這個(gè)benchmark上增加OAS使得bond的價(jià)格和市場(chǎng)價(jià)相等。
當(dāng)OAS算出來(lái)了以后,再用這個(gè)利率來(lái)測(cè)duration,這里不用再做一個(gè)OAS。
簡(jiǎn)單來(lái)講,算OAS是算出一條利率與bond價(jià)格的曲線。而算duration是測(cè)moving along這條利率曲線,來(lái)測(cè)增加一單位的利率會(huì)導(dǎo)致價(jià)格怎么變化。如果再高出2個(gè)不同的OAS,那就是在3條線上分別測(cè)了3個(gè)點(diǎn),不能用來(lái)算duration
