Why your backtest passes — and your live account doesn't
Out-of-sample testing isn't a technicality. It's the only honest way to know if a strategy has an edge. Here's the full process — and why rejection is the goal.
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The Turnaround Tuesday strategy: 23 years of data
79.6% win rate. Only 18.5% time in market. We ran Turnaround Tuesday on 23 years of QQQ data — including a rigorous out-of-sample test from 2019 to 2025.
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Portfolio construction, correlation, and position sizing for systematic traders.