这节课说discount rate 和收益率不一样.但之前的题目全部都是把discount rate当成收益率,是怎么回事?

Which of the following statements regarding the option adjusted spread (OAS) is most accurate? The option adjusted spread: A is the spread added to the Treasury spot rate curve that the bond would have if it were option-free. B is the spread that accounts for non-option characteristics like credit risk, liquidity risk, and interest rate risk. C for a putable bond is the Z-spread plus the cost of the option putable coast=ZS-option cost 还是ZS option cost? callable cosat = 什么？

老师，我想问下这道题的题意和解析部分，看了视频也没看懂。

老师您好，请问视频中讲样本方差的分母是n-1时讲到自由度举例说四个数1，2，3，x, 均值2.5，x=4,不理解怎么看出自由度是3的？

权证可以同时持有股票和期权，那股票和期权是否是等值的呢？？

税率改变不需要retrospective调整吗

老师，这里的SFAS和US.GAAP是不是都是表示美国会计准则？下面的IAS和IFRS都是国际会计准则的意思？

请问X小于M,经常账户流出?为什么?

老师 不应该是sp➕收益➖成本等于 fp吗

为何这题中的SR是用期望收益率减RF而不是用Ra10%去减？