The decline effect

Graphic: The Ebb & Flow
I had a driveway moment yesterday. On the way home from the gym I turned on NPR and got sucked into this segment on the decline effect, the tendency for experiments when repeated to yield less impressive results. And this phenomenon is apparently only partially accounted for by regression to the mean. You can listen to the segment here or read an article on the decline effect in the New Yorker here.

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