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0/2.5), |z_r|)` (the × (3.0/2.5) just normalises the body rule onto the same "3 = threshold" scale as the z‑scores). A strength of 3 = just over threshold; 6 = a violent move. ## 3. Step‑by‑step procedure ### Step A — Ingest ticks Source ticks arrive as (t, bid, ask) at ~1–5 Hz. Normalize: - mid = (bid + ask) / 2 - spread = bid − ask (sanity: should be > 0; otherwise swap the two — different brokers order them differently) - Drop duplicate ticks (same t and same mid as previous). - Optionally smooth the spread with an EWMA so the spread floor is robust. ### Step B — Build M1 candles from ticks For each tick, compute the candle bucket key k = floor(t / 60) (seconds since epoch ÷ 60). For each new bucket key, start a new candle and close the previous one: - Open = mid of first tick whose bucket key = k - High = running max of mid - Low = running min of mid - Close = mid of last tick whose bucket key = k - tickCount = number of ticks - lastSpread and meanSpread over the minute Only feed a candle into the detector after it closes (when the first tick of the *next* minute arrives). This prevents the in‑progress candle from triggering false spikes mid‑formation. Optionally also evaluate the in‑progress candle as a "provisional" spike for an early warning, but mark it differently from "confirmed." ### Step C — Maintain a rolling buffer Keep the last N + 1 closed candles in a deque (e.g. N = 14, so 15 candles total — 14 baseline + 1 current). Each time a candle closes: