Every way a backtest lies, and the handful of habits that stop it.
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.
In the app the same chapter ends in your figures rather than an example: how often you did the thing it describes, over your last ninety days. You pick one change to make, and Evidence checks afterwards whether it actually changed — from your journal, arithmetic, no opinion involved. Questions you get wrong come back a week later and again a month after that.
Open the free plan →