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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 overfitting…
Walk-Forward Analysis: Testing a Strategy Like a Quant
Walk-forward analysis re-optimizes a strategy on a rolling window and tests it once on the next unseen slice,…
Sharpe Ratio Explained: Comparing Strategies on Risk-Adjusted Returns
The Sharpe ratio is the standard way to compare strategies on return per unit of risk — and…
How to Design a Trading Indicator From Scratch
Every indicator is a transformation of the same open/high/low/close/volume data. The real skill in building one isn’t the…
Factor Investing Explained: Value, Momentum, Quality, and Size
Factor investing explained: what value, momentum, quality, and size actually are, the academic evidence behind each, and the…
Is Bitcoin Actually Correlated With Stocks? What the Data Shows
Bitcoin’s correlation with the S&P 500 has swung from near-zero to 0.74 to negative and back within about…