Data Sources & Avoiding Garbage-In/Garbage-Out
Every decision you make is only as good as the data behind it. How to pick reliable sources and spot the bad data that quietly wrecks a strategy.
Your trading decisions are a pure function of their inputs: feed in wrong prices or wrong fundamentals and even a perfect plan will faithfully produce a wrong answer. "Garbage in, garbage out" isn't a cliché in trading — it's a budget line. A single bad data point can cost a six-figure decision, while the same flaw caught at the door costs ten minutes of attention. If you ever automate, backtest, or even just screen ideas, the quality of your data is part of your edge.
Choosing a reliable source
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