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[求助]Fixed Income-原版书后题目R44

想请教一下CFA二级原版书后的题目,谢谢。 reading 44 -14题: 在计算effective duration 和convexity with an embedded option, what assumption is made aboutn the OAS when rates change. 答案中说是int变化时OAS保持不变。想请问这是一个什么逻辑,不太懂。另外,想请问modified duration和effective duration有什么区别么,尤其是什么情况下哪种能用哪种不能用?含权与否对于哪种duration能用是否有影响? reading 44-18题: in valuing a floating rate notes, it si necessary to make a modification to the backward induction method. 我理解下来,coupon=floating rate* par。如果value=PV( coupon+par) ,那么用floating rate去折现,不是仍然等于par么?为何会需要做调整? reading 44-22题A 在这里计算convertible bond的return时,为何不考虑dividend?

1. 首先,如果我们想得到effective duration和effective convexity,我们必须得到利率变化后的V+和V-;如果我们用二叉树模型估计含权债券的value的话,步骤如下(以V+为例):Step 1 Given the market price of the issue calculate its OAS using the procedure described earlier. Step 2 Shift the on-the-run yield curve up by a small number of basis points (
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