The Volatility Index is not in the database, but the actual volatility
is computed from the SP500 average. These two are not quite the same but they
are close enough. Strangely, the volatility is used by less than one percent
of the networks. This is probably because volatility is not a good predictor
of the 15-day forward slope. I do have nets that predict a 10-day slope and these
only use the volatility about one percent of the time.