The "Sports Illustrated jinx" refers to the fact that athletes who appear on the cover of the magazine often then experience a decline in performance afterwards. Some researchers attribute this to the fact that athletes who are placed on the cover are those who are at the top of their game, and performance naturally reverts back to a more normal level after time. These researchers are referring to the problem of

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Statistical regression refers to the phenomenon where extreme performances tend to be followed by more average performances, which explains why athletes at their peak might experience a decline after being featured.

The "Sports Illustrated Jinx" Refers to the Fact That Athletes