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Backtesting, explained honestly

Short pieces on the things that decide whether a backtest means anything: bias, costs, sample size and timeframes.

Choosing a timeframe without fooling yourself

The same rules can pass on 4h and fail on 5m. Why that happens, and how to compare timeframes fairly.

A 70% win rate over 12 trades and over 400 trades are different claims. Here is the arithmetic that separates them.

The five habits that turn a losing strategy into a beautiful equity curve, and the checks that expose each one.