medium · Order Flow Analysis footprint-delta
Footprint delta is computed by the bid/ask (uptick/downtick) rule: a trade at the ask counts +, at the bid counts -. During a fast one-tick-wide burst, a large institutional buyer posts passive bids and a flood of aggressive sellers hits them.
How will the printed delta most likely mislead a naive reader?
- Delta will read strongly negative even though a committed buyer is the one accumulating, because the rule credits the aggressors (the sellers) and ignores who provided the resting liquidity.
- Delta will print strongly positive here, correctly capturing the institutional buyer's quiet accumulation of size as clear, fully confirmable, net aggressive buying pressure overall.
- Delta will read close to zero across the burst, since the resting passive bids and the flood of aggressive sell prints are assumed to offset one another exactly on every single trade.
- Delta simply cannot be meaningfully computed inside such a fast, one-tick-wide burst of trading, so the reader should treat the entire bar's delta reading as undefined and disregard it outright.
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