Justin’s Notes

Why Both Sides of the Race Debate Can Be Statistically Right

2026-08-24 · AI-generated insight

These two notes appear to flatly contradict each other, yet both make empirically defensible claims — and seeing how that's possible is more illuminating than picking a winner.

Lewontin's famous finding is real: take any single genetic locus, and the variation within human populations dwarfs the variation between them. From this he concludes racial classification has "virtually no genetic or taxonomic significance." Winegard and Carl point to something equally real: researchers can sort skulls by continental ancestry with high accuracy, sometimes using only a couple of variables. Ordinary people classify by appearance because the differences "actually exist."

The resolution lies in a statistical subtlety Lewontin's argument glosses over — what A.W.F. Edwards later called "Lewontin's fallacy." Any single trait or gene is a poor discriminator between populations, exactly as Lewontin showed. But small between-group differences across many traits are correlated with each other, and correlated information aggregates. Stack enough weakly informative variables together and classification becomes highly reliable, even though each variable alone tells you almost nothing. The skull data Winegard and Carl cite is precisely this: two variables already get you to 80%; add more and accuracy climbs further.

So the honest synthesis is uncomfortable for both rhetorical camps. Against Lewontin: "most variation is within groups" does not entail "groups are indistinguishable" — that's a non sequitur, and populations are statistically identifiable. Against those who read classifiability as vindicating folk race concepts: the fact that ancestry can be inferred from correlated traits says nothing about how much meaningful difference exists, and Lewontin's core finding — that any given individual's genome is overwhelmingly shaped by individual rather than group variation — still stands.

The deeper lesson is about how statistical facts get conscripted into moral arguments. Lewontin moved from a true premise (within-group variance dominates) to a policy conclusion (classification is unjustifiable) via a hidden statistical error. His critics risk the mirror move: from "classification works" to conclusions the classification data don't support. Both notes are filed under Science Against Prejudice — but each shows how easily a correct measurement becomes an incorrect inference when the conclusion is wanted in advance.

Woven from these notes

It is clear that our perception of relatively large differences between human races and subgroups, as compared to the variation within these groups, is indeed a biased perception and that, based on randomly chosen genetic differences, human races and populations are remarkably similar to each other, with the largest part by far of human variation being accounted for by the differences between individuals. Human racial classification is of no social value and is positively destructive of social and human relations. Since such racial classification is now seen to be of virtually no genetic or taxonomic significance either, no justification can be offered for its
— Lewontin
The primary reason that natural philosophers began to classify humans into different races is that human populations look different from one another. Their skin colors, hair textures, facial structures, and stature all differ, often in predictable ways. Furthermore, these differences reflect their divergent geographical origins. In fact, researchers can classify human variation by continent quite accurately using only data from the human skull. (They are able to correctly classify human skulls into black and white Americans with about 80% accuracy, using only two variables.) Therefore, despite the common charge that racial classification is ipso facto racist, and that most Enlightenment typologies of human variety were motivated by prejudices and a desire to rationalize imperial domination, ordinary people and Enlightenment philosophers also took to classifying human differences for the mundane reason that such differences actually exist.
— Bo Winegard, Noah Carl Superior: The Return of Race Science—A Review