Now without any joking :
DMI in this case stands for Directional Movement Index
Now the Directional Movement is :
Quote:
Wilder defines directional movement as the largest part of the current trading range that is outside the previous trading range. From a mathematical view, it is the largest value of the following differences: High - PreviousHigh or Low - PreviousLow
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Directional movement is up or positive, when the difference between the highs is the greatest. It is down or negative when the difference between the lows is the largest value. Thus, the up directional movement is +DM, and down directional movement is -DM.
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One of the versions of DMI I have saw lacks the Directional Movement itself (hence the joke that it is not and DMI but an I)