老师解答时DD指的是什么？

老师这里讲的lognormal模型和讲义上讲的lognormal模型为什么不一样？

老师好，能否分别具体讲解一下Balance sheet CDO和arbitrage CDO?

老师好，c选项没有理解，能否具体讲解一下。谢谢。 Which of the following is not a distinction between cash CDOs and synthetic CDOs? A The assets are actually sold to the SPV in a cash CDO but are not in a synthetic CDO. B The cash CDO provides exposure to actual assets, whereas a synthetic CDO provides a similar economic exposure through credit derivatives C Cash raised from the issuance of securities is used to finance the purchase of the assets in a cash CDO and to collateralize the CDS in a synthetic CDO. D Cash CDOs can have at most one layer of subordination, whereas synthetic CDOs can issue many subordinated tranches of securities.

老师能再解释一下A吗？视频里解释没听懂

EE不是未来的某一时间点的值吗？C选项怎么说的是均值呢？

为什么现在视频都播放不了？

视频播放不了，请尽快解决

merton模型计算的DD和KMV模型计算的DD能相同吗？计算方法采用的数值都不一样

D选项surrender是决定的意思吗？