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We don't leave this to code review: by design, the data access layer can't see the future.", "source": "messages:quantEngineering.pitfalls.items.0.check" } ] }, { "id": "1", "source": "messages:quantEngineering.pitfalls.items.1", "title": "Synthetic ticks", "fields": [ { "label": "Flawed test", "value": "A four-point synthetic path fills at prices that never traded.", "source": "messages:quantEngineering.pitfalls.items.1.flawedCaption" }, { "label": "Corrected pipeline", "value": "The real tick path: every fill rests on a price that was actually seen.", "source": "messages:quantEngineering.pitfalls.items.1.fixedCaption" } ], "blocks": [ { "type": "paragraph", "text": "Fake price paths generated from minute bars create fills that never happened.", "source": "messages:quantEngineering.pitfalls.items.1.symptom" }, { "type": "paragraph", "text": "We rerun critical results on real tick data and a second feed source.", "source": "messages:quantEngineering.pitfalls.items.1.check" } ] }, { "id": "2", "source": "messages:quantEngineering.pitfalls.items.2", "title": "Overfitting", "fields": [ { "label": "Flawed test", "value": "One bright cell: results fall apart at neighboring settings.", "source": "messages:quantEngineering.pitfalls.items.2.flawedCaption" }, { "label": "Corrected pipeline", "value": "A broad, stable region: the chosen setting's neighbors hold up too.", "source": "messages:quantEngineering.pitfalls.items.2.fixedCaption" } ], "blocks": [ { "type": "paragraph", "text": "The best of hundreds of parameter combinations is picked and assumed to stay the best.", "source": "messages:quantEngineering.pitfalls.items.2.symptom" }, { "type": "paragraph", "text": "We choose parameters in one period and test them in a period they've never seen. 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