所以老师那个年限和经验的关系是自相关还是多重线性相关

老师 划红线这段话的意思我不是很明白 希望老师解释一下 谢谢 辛苦了

老师，这道题答案是B，但我怎么算是D

You have a long position in a digital call option -- an option that is also called cash-or-nothing -- on shares in Global Enterprises. The digital call has a strike price of USD 20 with one year remaining to expiration. Assume that the shares currently trade at USD 22 and annual return volatility of Global Enterprises shares is 15%. Which of the following sensitivities would be associated with this option? Ⅰ Delta is positive. Ⅱ Gamma is positive. Ⅲ Vega is negative. Ⅳ Vega is positive. Which statements are true? A. Ⅰ and Ⅲ B. Ⅳ only C. Ⅰ,Ⅱ and Ⅳ D. Ⅱ and Ⅲ 完全不会，请详细讲解，谢谢老师

老师 能不能解释下为什么D是对的？不是应该R方表示解释程度吗

老师，假设有一个每半年付50的年金，年利率是8%，三个月后就卖出了，要计算此时的clean price。我的解题方法是这样的，为什么用计算器按出来的结果跟公式算出来的结果不一样呢？我哪个数错了吗？还是我公式用错了呢？

439题答案选A但是流程不太懂，是买第三只债券同时卖前两只债券，还是有先后顺序？

W1+w2=1的？

X 折现两个半年？

Dollar roll 都是above carry?