请问为什么说Increasing the sector diversification of the portfolio would increase the degree of cross- correlation of the portfolio（模考2），然后课后题说The correlation of two stocks in different sectors is most likely lower than the correlation of two stocks in the same sector呢？这两个不矛盾吗？

2018年真题q8的最后一问，这个不在考纲里了吧？

2018年真题q8的B，请问是不是应该直接计算usd的无风险收益，然后再乘以汇率来计算？因为既然hedge return那获得的就是usd的无风险收益吧？

high-frequency data are more sensitive to asynchronies across variables, tend to produce lower correlation estimates; 怎么理解？

appraisal bias 为什么会有这个结论 calculation correltions with other assets tend to be smaller in absolute value compared to the true correlation

老师，这里A题目下面的notes是啥意思

请问R16Q5怎么理解呢。他们现金流到底是怎么互换的呢。谢谢

老师，我有点糊涂了。为什么foundation的operating cost 不考虑在计算公式里呢？

金程的Mock 1上午题第二题 ，annuity method 说introduces longevity risk. 书上写的是mitigate longevity risk 。这两个说法相反的？

这题后半个推荐一个方法解决appraisal data问题，怎么没说