Berkson’s Paradox

A kind of survivorship bias in that when there are two positively correlating traits that are (ostensibly) negatively correlated in a population that selects for these traits. For instance, GPA and SAT scores. Although it would seem at first glance that having a higher SAT score doesn’t lead to higher grades in a particular college, this leaves out the individuals with higher SAT scores that would have had higher GPAs had they not picked a another (better ranked) school to go to. Likewise, applicants with lower SAT scores that would have scored badly would not have been accepted to the school in the first place.

Published by patrick


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