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Been studying charts for a few months and I'm starting to piece together my own setups, but I'm not confident enough to throw real money at them yet. I want to check how my entry and exit rules would have actually performed over the past year or two before I commit. What's the easiest way to do that?
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Watch out for survivor bias in your tests, an index might show a beautiful uptrend, but the individual stocks that dropped out of that index are invisible in the chart. Running simulations only on current constituents gives you a much rosier picture than what actually happened in real trading.