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Backtesting & Validation Checklist

Pairs Trading Validation Checklist

Pairs trading lives or dies on whether the spread actually reverts and keeps reverting. Correlation is not enough; the statistical relationship must be stationary and stable. This checklist validates a candidate pair before any capital is committed.

12 ITEMSPublished May 26, 2026Live Content
By AI Fin Hub Research · AI Fin Hub Team

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Move item by item and keep your place

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Checklist Sections

Work in focused batches instead of one long wall

Section 1

Phase 1: Relationship validity

3 items
Use The ToolPlaygrounds

Pair Trading Cointegration Tester

Paste two price series. Engle-Granger cointegration test: OLS hedge ratio, Augmented Dickey-Fuller on residuals, Ornstein-Uhlenbeck half-life, z-score.

ToolOpen ->

Section 2

Phase 2: Reversion dynamics

3 items
Use The ToolPlaygrounds

Cointegration Half-Life Solver

Engle-Granger residual ADF + Ornstein-Uhlenbeck half-life from any two price/return series. Hedge ratio, p-value, spread chart. Browser-only.

ToolOpen ->

Section 3

Phase 3: Spurious-pair defense

3 items
Use The ToolCalculators

Backtest Overfitting Score

Upload a backtest trade log and compute Probability of Backtest Overfitting (PBO), Deflated Sharpe Ratio, and the odds your edge survives live trading.

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Use The ToolPlaygrounds

Walk-Forward Validator

Upload a returns CSV. Rolling or expanding IS/OOS windows, per-window Sharpe, walk-forward efficiency, and a concatenated OOS equity curve. Catches regime.

ToolOpen ->

Section 4

Phase 4: Tradeability

3 items
Use The ToolCalculators

Statistical Arbitrage Capacity Calculator

Maximum strategy AUM from signal half-life, daily volume, slippage, fees, and target Sharpe. Square-root impact closed-form.

ToolOpen ->
Use The ToolPlaygrounds

Execution Simulator

Model realistic order fills — square-root market impact, linear temporary impact, latency jitter, partial fills, and queue position. See the real cost.

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Pro Tips

Small moves that make the checklist easier to finish

Correlation tells you two series moved together; cointegration tells you the spread comes back. Only the second one is tradeable, and confusing them is the classic pairs-trading mistake.
The half-life is your holding period and your risk clock at once. A reversion that takes months exposes you to the regime change that breaks the relationship before it pays.
When you mine a universe for pairs, you are running thousands of trials. The best-looking spread is partly luck, so the out-of-sample test is not optional, it is the whole proof.

Sources & References

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Planning estimates only — not financial, tax, or investment advice.