On Balance Open Interest (OBOI)
The On Balance Open Interest (OBOI) is a total of the up and down open interest. The calculation is based on the On Balance Volume (OBV). When the close is higher than the previous close, the open interest is added to the running total, and when the close is lower than the previous close, the open interest is subtracted from the running total. This version of the OBOI is a moving total, not a cumulative total. That is, only the values from the past n days are totaled.
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