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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.
Unemployment rate is the total amount of able-bodied population expressed as relative quantity. The level itself is calculated as follows. Every month Bureau of Labor Statistics of the U.S. Department of Labor conducts survey of 60 000 households and more than 375 000 enterprises - the establishment survey. Fundamentals of surveys include such statistical data as: For Household survey: age, sex, marital status, employment status. For the Establishment survey: average weekwork, average hour earnings, wages.
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