regression to the mean

Regression to the mean is a statistical concept that describes how extreme or unusual results tend to move closer to the average when measured again. For example, if a student scores exceptionally high on one test due to luck, their next score is likely to be closer to their typical performance rather than equally extreme. This happens because extreme results often include some randomness or chance, and over time, outcomes tend to balance out toward the average. It's a natural tendency observed in many areas, reminding us that extraordinary events are unlikely to be consistently repeated without underlying changes.