课件里面 提到 correlation volatility is lowest in an economic expansion and highest in normal economic period 同时 也提到了 there is a positive relationship between correlation level and correlation volatility.
综合上述两点,当correlation voaltity 在经济normal时最大,同时因为correlation volatility 与 correlation level 正相关,那么得出 correlation level 在经济 normal 时也应该最大。
可以 课件里说 correlation level 是在recession 的时候最大。
请教一下这边出现 矛盾结论的原因