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Tom Demark, in his book 'Day Trading Options', has developed a market-timing indicator (oscillator), called TD Range Expansion Index (REI), which identifies areas that are risky for buying and selling. A weakness in the security or market price could occur if the value of the TD Range Expansion Index is higher than a defined threshold. Above this value, the indicator prevents investors from buying and selling the stock or the security prematurely.
The TD Range Expansion Index is calculated using the close, low and high prices. It produces an oscillator whose values vary from -100 to +100. When the TD Range Expansion Index falls below -45, which is an oversold area, then rises above -45, this tell us that price is becoming stronger. But, when the TD Range Expansion Index rises above +45, which is an overbought area, and then falls below +45, this tell us that the price is weak or is becoming weaker and in that case, as I said earlier, investors should avoid buying (when the price is advancing), and selling (when the price is declining).
The function is named 'TDREI' and it has no parameters. The TD Range Expansion Index formula is optimized for backtesting and analysis uses. The indicator formula uses 12 backward bars and no forward bars.
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