Errors: same-bar features, no lag, training on future, ignoring slippage, single split, no regime split. Each adds fake edge. The free audit removes them: lag one bar, walk-forward, include slippage, audit importance. A backtest is a hypothesis test, not a brag.
The worry: a lying backtest feels like proof until live capital meets it. Run this free audit before trusting any model, including ours. The first question on any result should be 'where did it leak?'
Q: Top error?
A: Same-bar features / no lag leaking future.
Q: Slippage ignored?
A: Inflates returns; include 0.1-0.5 percent.
Q: First question?
A: Where did it leak?
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By Shakti Tiwari · Options AI research pillar. NISM XII certified. Educational only, not investment advice; verify before acting.