Scott,
I've studied the VXO and now the VIX for some time too. I've found that they correlate pretty well, though if you want to go back historically, you have to stick with the VXO. There are a lot of ways to look at it short term. E.g. I run a MACD on a 30' to get early warning of trend changes. I used to have a trading model based upon the daily and a set of BB. It tore the cover off the ball for a while then quit.
I mostly use it now as a heads up indicator. My favorite permutation is the Relative VIX. This is a measure of the deviation of the VIX from it's 200-day SMA. Now, I can theorize as to why this indicator works as a bottom spotter, but the bottom line is, it's VERY good and has been for a long, long time.
How do I use it? When I see an "excessive" reading, I go on alert. I look for confirmation from sentiment measures. If I have them, then I have a "go" for a Buy as soon as I get price and/or breadth confirmation. During the positive part of the seasonal cycle, I'm quicker to buy, and during the negative part, I'm slower to buy. BUT, when you get the relative VIX up there, it's really just a matter of picking your spot to get long. It doesn't mean that we won't test or even go lower, but you're going to get a rally (as we have been).
Take a peek at the last chart (BTW, there was an error. The Relative VIX is lower than at the June 06 lows, though not by a lot).
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