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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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