[centimeter]

> little basis in the scientific reality of human genetic variation

This meme dates back to a loose claim made by R. Lewontin back in the 70s. In fact, you can very precisely and reliably recreate the "intuitive" human racial categorization using unsupervised algorithms, like doing multi-dimensional clustering over fixation indices. (It does not work using single-dimensional clustering, which is what Lewontin was talking about.)

Modern biologists usually talk in terms of clines rather than races, but this is just using the first derivative instead of the zeroth - you'll get the same result either way.

> Africa actually has more human genetic variation than anywhere else.

SNP diversity has ~nothing to do with phenotypic variance.

[claudeganon]

Of course the question here is recreate whose “intuitive racial categorization” because all of that is historically and culturally specific. Saying it’s possible for a computer to recreate these categorizations presumes that the categorization has some objective reality outside of this when they’re just a variable heuristic determined by all those inputs.

[centimeter]

> all of that is historically and culturally specific

Not really - almost everyone can agree on "middle eastern/north african", "east asian", "south asian", "black african", "white", etc. If you force people to pick a single-digit number of major categories, they're probably going to come up with the same categories that k-means in fixation space would.

[claudeganon]

This is an evidence-free supposition, consistent with your pattern across this thread of making broad claims without anything to support them. You’ve provided no proof that k-means on a representative sample of phenotypic variation in the groups you cite would return this result.

That almost everyone can agree on these categories is also contrary to reality. For example, many of who you describe as East Asians consider themselves racially distinct both within their societies and from their nearby neighbors. Also, what major categories do mixed race people fall inside?

[centimeter]

It's not my job to provide detailed proof on every HN post I make; I'm just pointing out something relevant, and if it interests you, you can go ahead and find where people have already done this. I think I've been specific enough that you can find this stuff on your own. This took me about 1 minute to find: https://www.discovermagazine.com/health/to-classify-humanity...

> many of who you describe as East Asians consider themselves racially distinct

That's why I specifically mentioned the number of racial categories involved. Obviously as the number increases you can have different clustering results.

> Also, what major categories do mixed race people fall inside?

Obviously not into any of them, if we're talking about a simple mechanical classifier with high separation.

[claudeganon]

The number of racial categories would itself be an arbitrary limit not corresponding to actual genetic variance, nor would classification under such limit capture said variance, and none of it would match up to the folk biology of racial categorization. This is the general problem with reasoning backwards from 19th century gobbledygook about human genetic variation instead of beginning with the genetics themselves.

It may not be “your job” to provide such evidence, but you’ve made a series of specific claims about things like the rate of phenotypic variance among different racial groups. If you don’t want to defend them, that’s your prerogative, but you also can’t expect them to be received as authoritative or remain free of challenge.