The batting averages of the best batters slowly decrease as the baseball season unfolds. Is this because the pitchers get better? Or, do these batters simply get worse? “No” and “no,” say statistical authorities. Their explanation: “regression toward the mean.”

To see some specific information about baseball batting averages and regression-toward-the-mean, go to

To read about the general phenomenon of regression-toward-the-mean, go to


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