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.