Although Shawn felt terribly depressed when he began psychotherapy, he was much happier by the time he had completed therapy. It would be reasonable to attribute some of his improvement to

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Quizplus · Accepted Answer

Regression toward the mean refers to the phenomenon where extreme initial measurements tend to be closer to the average upon subsequent measurement, which can explain some of Shawn's improvement.

Although Shawn Felt Terribly Depressed When He Began Psychotherapy, He