The volatility index (VI) is defined as the standard deviation for one round, betting one unit.

Additionally, the term of the volatility index based on some confidence intervals are used.

It is important for a casino to know both the house edge and volatility index for all of their games.

Technical indicators, like the volatility index of the Chicago Board Options Exchange, signal an even more topsy-turvy month to come.

The Chicago Board Option Exchange's volatility index had its two highest readings of the year this week, on Wednesday and yesterday.

In a subsequent paper, Professors Brenner and Galai proposed a formula to compute the volatility index.

Before July 23, the last time the volatility index closed above 50 was on Sept. 21, 2001.

When the volatility index reached highs of 39.96 in 1997 and 48.56 in 1998, the market also hit bottoms.

Mr. Mullins said he was already making use of the volatility index.

It is analogous to the VIX implied volatility index on the S&P 500.