Θεωρία:
The Detrended Price Oscillator (DPO) is an indicator that attempts to eliminate the trend in prices. Detrended prices allow you to more easily identify cycles and overbought/oversold levels.

Ο Δεικτης Detrended Price Oscillator (DPO) είναι ο δείκτης που προσπαθεί να εξαλειψει the trend στις τιμές. Οι Detrended τιμές σας επιτρέπουν να αναγνωρίζεται πιο έυκολα cycles and overbought/oversold levels.

Ο υπολογισμός του γίνεται ως εξής:

you simply center an x-period moving average by shifting it back x/2 + 1 periods. This centered moving average is then subtracted from the close. The result is an oscillator that crosses above and below zero.
Since the DPO is shifted back "x/2 + 1" periods, the last "x/2 + 1" periods will have no values.