Individuals that are far from the mean on the first measurement will lie closer to the mean on second; this phenomenon is called regression towards the mean.
What is regression?
Regression analysis is a group of statistical procedures used in statistical modelling to determine the relationships between a dependent variable and one or more independent variables.
If one sample of a random variable is extreme, the next sampling of the same random variable is likely to be closer to its mean. This is known as regression toward the mean.
Background A statistical phenomenon called regression to the mean (RTM) can cause natural variation in repeated data to appear as actual change. It occurs when measurements that are frequently followed by ones that are more typical of the range are unusually large or small.
Hence, individuals that are far from the mean on the first measurement will lie closer to the mean on second; this phenomenon is called regression towards the mean.
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