https://judyailab.com/en/tags/statistical-test/ Recent content in Statistical Test on Judy AI Lab https://judyailab.com/logo.jpg https://judyailab.com/logo.jpg Hugo -- 0.147.4 en Fri, 13 Mar 2026 07:29:33 +0000 https://judyailab.com/en/posts/z-score-reality-check/ Fri, 06 Mar 2026 00:00:00 +0000 https://judyailab.com/en/posts/z-score-reality-check/ Quantitative traders often get misled by sky-high paper trading win rates. This article uses 33 real trades to expose the statistical illusion behind 87% win rate, applying Z-score testing, Bayesian adjustment, and Overfitting Index (OFI). Learn why 50 trades is the minimum threshold and how many samples different win rates need to prove real edge—verify your strategy with math before risking real money.