Again, I am not sure what you are calculating. You should be seeing a value around 3.25. Mid term (say 1 year), it's around 50th percentile (average has been 3.42 last year), long term it's pretty rich (expand your graph for the last 5-7 years to put things in perspective).Still seeing it as low.
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Try this (since you have a Bloomberg) in CIX:
(SPX 3M 90 VOL Index - SPX 3M 100 VOL Index) * 0.5
PS. Oh, I see - you are using 110 call strike. Yeah, that's not going to be very useful since at these levels of vol there will be a call skew there actually - lowest strike is 105%ish
PPS. That SKEW index that you showed before is interesting - I guess the intention was to make a non-parametric strikeless representation of skew similar to VIX, but it's might counter-intuitive in it's dynamics
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