DetrendedPriceOscillator

Is a market strength indicator.
Is computed using the high, low, and close prices, and volume.
Returns one time series, the difference between the close and an 8-period future value from a 14-period moving average.
FinancialIndicator["DetrendedPriceOscillator", n] uses an n-period moving average and -period future value.
The first value occurs after periods and the last value occurs periods before the end of the data.