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Donald Dorsey is known for developing technical analysis indicators such as the Mass Index Indicator and the Relative Volatility Index. He has also created and introduced the Inertia trading indicator in the Stocks & Commodities magazine issue of September 1995.
In Physics, Inertia is the tendency of an object to resist to acceleration. Dorsey has chosen this name because he believes that trend and inertia are related and that it takes more effort and energy to reverse the direction of a stock or market than to keep it in the same direction.
The inertia indicator measures the market, stock or currency pair momentum and trend by measuring the security smoothed RVI (Relative Volatility Index). The RVI is a technical indicator that estimates the general direction of the volatility of an asset.
The inertia indicator returns a value that is comprised between 0 and 100. Positive inertia occurs when the indicator value is higher than 50. As long as the inertia value is above 50, the long-term trend of the security is up. The inertia is negative when its value is lower than 50, in this case the long-term trend is down and should stay down if the inertia stays below 50.
The trading indicator name is "inertia" and it uses a 20-Bar simple moving average as a smoothing function.
Trading rule example:
buy = Inertia() > 50;
Trading financial instruments, including foreign exchange on margin, carries a high level of risk and is not suitable for all investors. The high degree of leverage can work against you as well as for you. Before deciding to invest in financial instruments or foreign exchange you should carefully consider your investment objectives, level of experience, and risk appetite. The possibility exists that you could sustain a loss of some or all of your initial investment and therefore you should not invest money that you cannot afford to lose. You should be aware of all the risks associated with trading and seek advice from an independent financial advisor if you have any doubts.