hard · 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?

  1. 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.
  2. Delta will read strongly positive, correctly capturing the institutional buyer's accumulation as net buying pressure.
  3. Delta will read near zero, because passive bids and aggressive sells offset one-for-one on every print.
  4. Delta cannot be computed in a one-tick-wide burst, so the reader should treat the bar's delta as undefined.

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