Implied vs Realized Volatility: Why the Gap Between Concept and Code Matters

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A technical article by Shakti Tiwari on DEV Community explores the structural differences between implied and realized volatility, framed as an educational guide rather than investment advice. The piece argues that most tutorials cover observation and decision-making but omit the third critical component: actual transaction costs and realistic fill modeling. Tiwari warns that skipping details like data timestamping, past-only signal rules, and realized fill costs introduces biases such as look-ahead bias and strategy leakage. The article emphasizes writing system logic as testable contracts, asserting that a verifiable one-sentence rule is more reliable than an elaborate but untested architecture. No live market figures are cited, as the author focuses on durable structural principles applicable across datasets.

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