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Purchasing Managers' Index (National Association of Purchasing, PMI index) represents a summary report of surveying managers in the field of industry. PMI index is used to measure change of production output, the number of new industrial orders, inventories as well as operation speed of suppliers. The goal of this economic indicator is to provide the information about shaping of price policy, tendencies in business and broadly in the economy. PMI (otherwise called NAPM) is measured as percentage % from 1 to 100. Respondents to the survey answers simple questions. Choice of answers is usually limited by “yes”, “no” and “no change”. Taking into account the structure of questions, it is hard to escape a conclusion that psychological factors heavily impact index value, which can distort figures.
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.
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