Josh's Substack
Josh MalizziMy personal Substack
| Platform |  | Pricing | Only free issues | Publishes | Daily |
|---|---|---|---|---|---|
| Issues | 13 | Founded | 7 months ago | Last Issue | 2 months ago |
| Active | |||||
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joshmalizzi.substack.comLatest Issues
The P-Test: Measuring Whether Your Trading Edge Is Real or Just Random Luck
If a trading system can perform nearly as well on randomized market data as it does on real market data, you don't have an edge, you have an illusion.
One of the biggest mistakes quantitative traders make is confusing historical profitab...
OHLC Bar Permutation: How to confirm your trading system will work
“Permutation and Randomization Tests for Trading System Development” by Timothy Masters is one of those books that helps us understand that most trading systems do not fail because markets are unknowable. They fail because we fool ourselves...
What Is an Ensemble? Let's talk about it. (w/case study)
In Advances in Financial Machine Learning by Marcos López de Prado, de Prado describes ensembles as a combination of multiple models or classifiers whose outputs are aggregated to produce a single prediction, with the goal of improving robu...
The Trade Count Secret: Why Most Trading Systems Fail Out-of-Sample
Most traders obsess over Profit Factor, Sharpe Ratio, Monte Carlo tests, Walk-Forward testing, and regime filtering. But there is a deeper principle underneath all of it. It does not directly improve your equity curve. It does not optimize...
Superpower in Trading: How Portfolios Crush Risk
Most traders spend their time obsessing over individual systems. The perfect entry. The perfect indicator. The one setup that “finally works.” But professional traders, the ones who survive decades, not months, obsess over something very di...
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Authors
The writers behind this newsletter.
I analyze markets through statistics, systematic testing, and probability theory. I don’t predict prices, I measure edge, stress-test it across regimes, and show how portfolios transform ordinary systems into professional-grade strategies.
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