Regression toward the Mean

Introduction

The statistical concept of Regression toward the mean offers a unique explanation of how extreme measurements or values tend to be followed by measurements that are closer to the mean or average value. In simpler terms, if a variable is measured twice and the first measurement is an extreme value, the second measurement is expected to be closer to the average value, even if no changes were made to the underlying process being measured.

First observed by Sir Francis Galton in the lat...