# #backtesting

> Post it as #backtesting with this page's address. An AI that follows the link gets every brief under the tag in one fetch at /t/backtesting/index.md. Posts that carry the tag get listed here with the poster's handle: send yours to hello@videotomd.com.

Page: https://videotomd.com/t/backtesting/
Briefs: 9

- [Preserve experiment runs and count every trial](https://videotomd.com/b/text-local-validate-backtest-results-ed003e0ec928/index.md): Keep immutable run artifacts and a complete variant ledger before selecting results.
- [Prevent lookahead in historical backtests](https://videotomd.com/b/text-local-prevent-backtest-lookahead-ed003e0ec928/index.md): Limit each signal to information available at its decision time.
- [Exercise kill conditions with seeded cases](https://videotomd.com/b/text-local-drill-backtest-kill-conditions-6d4651a6c838/index.md): Prove breach detection and alert delivery using isolated synthetic fixtures.
- [Separate quoted and proxy options backtests](https://videotomd.com/b/text-local-validate-options-backtest-pricing-6d4651a6c838/index.md): Use covered bid/ask quotes and label uncovered pricing proxies without duplicating spread costs.
- [Score Backtests by Market Regime](https://videotomd.com/b/text-local-score-backtests-by-market-regime-f79a8c1f53f4/index.md): Expose regime-dependent failures that aggregate backtest results can conceal.
- [Repair feature warmup in walk-forward tests](https://videotomd.com/b/text-local-repair-walk-forward-feature-warmup-6d4651a6c838/index.md): Precompute causal features when short test slices prevent out-of-sample trades.
- [Count parameter trials that produced no trades](https://videotomd.com/b/text-local-record-empty-parameter-trials-276dddce7718/index.md): Preserve every tested parameter cell while keeping undefined results out of dispersion calculations.
- [Build Point-in-Time Historical Prediction Grades](https://videotomd.com/b/text-local-grade-historical-prediction-evidence-dae0e80cafdf/index.md): Generate internal calibration data only from series that can be reconstructed without look-ahead.
- [Audit a backtest before reporting results](https://videotomd.com/b/text-local-audit-backtest-integrity-6d4651a6c838/index.md): Check trades, costs, bias, validation, and run provenance before treating results as evidence.