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   Detrended Price Oscillator     
DETRENDED PRICE OSCILLATOR

Overview

The Detrended Price Oscillator ("DPO") attempts to eliminate the trend in prices. Detrended prices allow you to more easily identify cycles and overbought/oversold levels.


Interpretation

Long-term cycles are made up of a series of short-term cycles. Analyzing these shorter term components of the long-term cycles can be helpful in identifying major turning points in the longer term cycle. The DPO helps you remove these longer-term cycles from prices.

To calculate the DPO, you specify a time period. Cycles longer than this time period are removed from prices, leaving the shorter-term cycles.


Example

The following chart shows the 20-day DPO of Ryder. You can see that minor peaks in the DPO coincided with minor peaks in Ryder's price, but the longer-term price trend during June was not reflected in the DPO. This is because the 20-day DPO removes cycles of more than 20 days.


Calculation

To calculate the Detrended Price Oscillator, first create an n-period simple moving average (where "n" is the number of periods in the moving average).

Now, subtract the moving average "(n / 2) + 1" days ago, from the closing price. The result is the DPO.

 


 






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