check in stub for "Imperfect Trait Measurements Regress to the Mean"

(This one will require a bit of math that I've seen the outline of for a
long time, but hadn't yet got around to mastering.)

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+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)
+
+study material: https://people.eecs.berkeley.edu/~jordan/courses/260-spring10/lectures/lecture5.pdf