RVOL is the best filter in trading, measured almost everywhere wrongly.
Relative volume asks the only question that matters early: is anyone actually here? But divided by an average full day, the way most tools compute it, the number is meaningless until noon. The fix is one idea: compare this moment to the same moment.
Same window, own history
Proper RVOL takes the volume in this 5-minute window and divides it by the name's own average for that exact clock window over the last 20 sessions. 7:35 against 7:35. Computed that way, RVOL 8 in the premarket means eight times the participation this name has ever had at this hour, a fact you can act on. Computed against a full day, the same situation reads 0.3, and your scanner sleeps through it.
RVOL is necessary, never sufficient
High adjusted RVOL with no catalyst attached is a genuine surface: sometimes the filing lands twenty minutes later, and being early to that is the whole game. But RVOL also spikes mechanically: post-halt resumptions, rebalance days, a single sweep into a quiet name. The number says a crowd arrived; it doesn't say why, or whether they're right. That's what the catalyst join and the chatter board are for.
One more honesty: RVOL against a 20-day baseline degrades when the last 20 days were themselves abnormal. A name in its third week of promotion has a polluted baseline: the board flags elevated baselines rather than letting the ratio quietly shrink.
Classic RVOL misreads
The 3:55 pm trap
Naive RVOL crosses 1.0 for everything late in the day as the denominator catches up. A scanner that lights up at the close is measuring arithmetic, not interest.
20× nothing
A name that normally trades 2,000 shares an hour prints 40,000 and reads RVOL 20. The absolute dollar floor exists because ratios flatter empty rooms.
The polluted baseline
Three weeks into a promotion, "normal" is already abnormal, and RVOL under-reports. Baseline health has to be shown, not assumed.
One print, no crowd
A single block sweep spikes the window. Real participation builds across consecutive windows: the slope matters more than the spike.
Names trading far above their own normal participation for this exact time of day.
Claim the adjusted-RVOL template.
Time-of-day basis, premarket and intraday thresholds, dollar floor: set up and explained, in your workspace on day one.
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