Six technical phases — correlation ≠ cointegration, and OOS ≠ untouched OOS.
Phase 1 — RELATION
Two-asset foundations and integration tests I(0) / I(1).
Phase 2 — SPREAD
Construction + mean reversion — Spread = A − βB, hedge ratio, and OU diagnostics.
Phase 3 — POLICY
Signal, Ornstein-Uhlenbeck, and friction — costs, commissions, and borrow.
Phase 4 — TIME
Stability, dynamic tracking, and structural breaks — a broken equilibrium is retired.
Phase 5 — SEARCH
Large-scale pair search, multiple testing, and causal out-of-sample validation.
Phase 6 — LAB
A reproducible pair-discovery pipeline, failure taxonomy, and capstone engine.