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Directional Movement Index (DX)
Directional Movement Index (DX) is indicator in technical analysis which is based on two other Welles Wilder's indicators: negative directional indicator (DI-) and positive directional indicator (DI+).
DX is calculated by formula:
For directional movement index period (n) is usually used value of 14.
Directional Movement Index (DX)
Interpretation
If DI+ crosses above DI-, you should go long. If DI- crosses above DI+, you should close position (go short).
Example
Open chart for google with DMI indicator.