Title: Imperfect Trait Measurements Regress to the Mean Date: 2020-01-01 Category: commentary Tags: epistemology Status: draft (a focused post explaining this slight _technical_ countercounterpoint to the morally-laudable "treat everyone as an individual" canard; use the example of guessing people's height on seeing them from afar; do the actual conjugate-prior calculation—maybe even in both directions) > It should be stated at the outset that for nearly all of the sex differences described throughout this book, there is an overlap in the distributions of girls and boys and women and men. As a result, none of the implications described in this chapter (or in earlier chapters) can be used to make judgements about any individual boy, girl, man, or woman > > David Geary, _Male, Female: The Evolution of Human Sex Differences_ study material: https://people.eecs.berkeley.edu/~jordan/courses/260-spring10/lectures/lecture5.pdf