Forex encyclopedia

Relative Volatility Index was elaborated by Donald Dorsey in 1993 and introduced in “ Technical Analysis of Stocks and Commodities” magazine. RVI is not a separate indicator; it is used to confirm signals and improve trading systems. This index measures forces of volatility movement. It does not duplicate signals of other oscillators, but just confirms them. RVI and Relative Strength Index are very much alike, but they additionally demonstrate highest and lowest points of price of standard deviation in a certain range. RVI is calculated in a way similar to calculation of RSI, but here 10-days' standard deviation of close price is taken instead of change of price.
In measurement formula for Joe Granville indicator, close prices compared with the purpose of adding or deducting of volume, whereas Williams' indicator open and close prices are compared. Marc Chaikin compares close prices with the middle of range from minimum to maximum. The history of indicator is interesting on its own. In Larry Williams formula, Chaikin substituted open price for price of range. The reason of change was not that he considered it wrong, but that he was not able to find data on prices of opening. That time prices were taken from daily papers, which, due to some reason, stopped publishing prices of opening.
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