Why it matters
It is the single most common source of false conclusions about what worked.
Core term · Francis Galton
Regression to the Mean
After an extreme result, the next one tends to land closer to average — with no cause required.
Areas of life
Judgementperformancestatistics
How to handle it
Before crediting an intervention, ask what would have happened anyway.
Who shaped this idea
The thinker behind it
Foundational idea Francis Galton A concept that shaped the field beyond any single school.
From concept to practice
Turn Regression to the Mean into a question you can answer.
Psipas asks you one small, honest question at a time — and builds the picture from your answers.