Evidence Academy
Four books on the parts of trading that are arithmetic
27 chapters, 144 minutes, free to read here. Written and checked rather than
generated — every claim is either arithmetic or named as craft knowledge.
No sign-up needed to read any of it.
Most trading courses teach chart patterns. These four do not, because that is not where accounts are lost.
They cover risk and position size, how to read whether you actually have an edge, why almost every confident
statement traders make about their own numbers comes from a sample far too small to support it, and every way a
backtest lies to the person running it.
Foundation
The psychology of trading
Loss aversion, tilt, revenge trading, sizing as a psychological decision, what a win rate does and does not tell you, and how to design a rule you will not break.
9 chapters · 27 min →
Foundation
Risk and position size
What risk actually is, how to size a position backwards from it, why a fixed percentage behaves so differently from a fixed lot, and how a daily limit stops a bad day becoming a bad month.
6 chapters · 40 min →
Core
Reading an edge
Expectancy, why a win rate on its own is meaningless, how large a sample has to be before a difference is real, what a losing streak proves, and how to tell a broken edge from an ordinary bad month.
6 chapters · 39 min →
Advanced
Backtesting without fooling yourself
Hindsight, overfitting, in-sample versus out-of-sample, the costs people forget, what Monte-Carlo actually tells you, and the conditions under which a backtest is worth believing.
6 chapters · 38 min →
The version that knows your trades
Reading is the cheap half. In the app each chapter ends in your own figures, you pick one change to make, and
Evidence measures afterwards whether it changed — from your journal, not from your impression. Chapters surface
themselves when your numbers cross a line, and questions you get wrong come back a week later.
Open the free plan →