I am confused about the implementation of RVOL or RDV as you named it.

The Relative Daily Volume indicator is an indicator that compares current cumulative volume to the cumulative volume for a given time of day, measured as a ratio. Current volume from open to current time of day / Average over the past x days from open to current time of day

The typical implementation for intraday trading is: Multiplier of the average 21 day volume based on time of day with an adjustment for simple cosine wave (higher volumes at beginning and end).

Forget about the cosine adjustment for now.  The indicator should give me the ratio of the current cumulative volume for the day over the 21 day average of the volume at that time.

The example provided is for daily data and only gives RVOL at 16:00.  For intraday trading you need RVOL for every minute.

The Introduction exactly stipulates what I am trying to do but I can't figure out a combination of period and resolution to achieve that.

Our trading platform has RVOL on the level 2 window and it is heavily used by our traders. 

RV field below.

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