Regression to the mean explains that in many cases data will tend to even out—i.e., if a variable is extreme on the first observation, it will tend to be closer to the mean on the next observation.

In this article, you'll learn the basics of simple linear regression, sometimes called 'ordinary least squares' or OLS regression—a tool commonly used in forecasting and financial analysis. We ...

With a correlation that low, there will be some mean regression at work. Think of it this way. Seven door-to-door salesmen go out and sell as many vacuum cleaners as they can on a Sunday.