老师好，百题投资第7题，看了解析，还是似懂非懂。 Value and momentum are opposite each other in that value investing is inherently stabilizing. It is a negative feedback strategy where stocks that have fallen in value eventually are priced low enough to become value investments, pushing prices back up. Momentum is inherently destabilizing. It is a positive feedback strategy where stocks that have been increasing in value are attractive to investors, so investors buy them, and prices increase even more. Momentum can be riskier than value or size investing in that it is more prone to crashes. 价值策略是负反馈，追涨杀跌是正反馈是什么意思呢？价值策略不是HML吗？不是买入价值高的卖出价值低的么？怎么说是股票价格足够低成为价值投资呢？请老师帮助理解一下这部分内容，谢谢

老师，请问这个题目里，A的权重乘以Beta加上B的权重乘以Beta的和不是应该等于1吗？现在好像加起来不等于1呀。

If our information ratio is 0.5, and we desire 5% active risk, we should choose an active risk aversion of 0.05.老师这里的数据怎么算出来0.05的？

答案有误，应该是-12%而不是+12%。因为是e^-rt

贝塔为什么不选后面那个

请问这道题怎么做？谢谢

在拟合操作风险损失的分布时，内部数据和外部数据不是各自不能单独使用，必须混在一起使用吗？ 为什么这张ppt 第一句 only using internal data?

为什么习题册上marginal default 都是用的forward default 的算法

为什么答案选D，其他几个选项是什么意思？

为什么选择C不选B？