jlht 发表于 2012-6-3 19:18
Lao Da, how to do you calculate the points between SPX and /ES?
ES is future index of SPX.
It's about 5 ~ 6 lower when far away from expiration. The difference is premium.
It gets closer (< 1 pts difference) when expiration approaches.
There must be a way to calculate the premium. But too complex, people seldom use it.
An easy way is to watch the difference in day time. SPX vs. ES.