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What Is Overfitting in Backtesting (And How to Avoid It)
Overfitting is why a beautiful backtest and a losing strategy are so often the same thing. What it…
Walk-Forward Analysis: Testing a Strategy Like a Quant
Walk-forward analysis re-optimizes on a rolling window and tests once on the next unseen slice. How it works,…
Sharpe Ratio Explained: Comparing Strategies on Risk-Adjusted Returns
The Sharpe ratio compares strategies on return per unit of risk — and it flatters some dangerous systems.…
How to Design a Trading Indicator From Scratch
Every indicator transforms the same OHLCV data. The real skill isn’t the formula — it’s normalization, the smoothing-vs-lag…
Factor Investing Explained: Value, Momentum, Quality, and Size
Factor investing explained: what value, momentum, quality and size are, the evidence behind each, and the ‘factor zoo’…
Is Bitcoin Actually Correlated With Stocks? What the Data Shows
Bitcoin’s correlation with the stock market swung from near-zero to 0.74 to negative in a year. What the…