DirectionalMovement

Commonly abbreviated as DX or DMI.
Is a trend indicator.
Was developed by Welles Wilder.
Is computed using the high, low, and close prices.
Returns three time series, which are the positive and negative directional indicators, and directional movement over 14 periods.
FinancialIndicator["DirectionalMovement",n] uses a n periods.
The first value in the time series occurs after n periods.