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Texto obtenido de la página Web de Equis:
Oscillators generally begin by calculating a percentage change of current price from some previous price, where the previous price is the adaptation-level or reference point. The mind is attuned percentage changes because they represent returns. If you bought Microsoft Corp. stock (MSFT) at $50 and it goes to $80, you make 60% before dividends. If you bought Berkshire Hathaway (BRK) at $4,000 and it rises to $4,030, the same dollar gain, you make 0.75% before dividends. It's the percentage change that counts. Relativity again.
Coppock reasoned that the market's emotional state could be determined by adding up the percentage changes over the recent past to get a sense of the market's momentum (and oscillators are generally momentum indicators ). So if we compare prices relative to a year ago - which happens to be the most common interval - and we see that this month the market is up 15% over a year ago, last month it was up 12.5% over a year ago, and 10%, 7.5% and 5%, respectively, the months before that, then we may judge that the market is gaining momentum and, like a trader watching for the upward crossover of the moving average, we may jump into the market."
The MetaStock™ formula for the Coppock Curve is:
(MOV(ROC(MOV(C,22,S),250,%),150,E))/100
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