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https://en.wikipedia.org/wiki/Minnesota_Transracial_Adoption_Study
Isn't this kind of it?
I mean yes, but I’d consider a 10-15 IQ test differential to be fairly minor, it’s one σ at best. It’s there, but unless you’re doing high level stuff, I don’t think most people would be able to tell the difference at a glance between IQ 115 and IQ 100. At lower IQ it makes a difference sure, but for average IQ levels it’s not that much.
How about 100 versus 85, which as far as I know is approximately the gap actually in question?
AFAIK as IQ is deliberately intended to be normalized, the gap is exactly the same 85 to 100 as 100 to 115, and if you think that those two aren't the same, you are also inherently saying that IQ is the wrong tool for the job. That's not even getting into the whole "what benchmark do we set 100 at", do we update it year to year or try to peg it to some historical benchmark (though this is not necessarily fatal to IQ as a metric in the same way the first is, it does present a question that must be addressed when using IQ).
I'm not sure what you're even trying to get at here. A fifteen point gap at the higher end of the distribution isn't likely to be noticeable in everyday casual interaction, but at the lower end it can be the difference between someone who can at least tell you their own name and a total potato.
The people who want to pooh-pooh the utility of IQ as a metric have had the reigns of society for generations now and their attempts at racial uplift have been a humiliating failure.
Simply using IQ necessitates that you grapple with these things. That's the nature of using numbers to describe something human. You, the invoker of IQ, need to prove the numbers work as numbers and aren't better being left as philosophical concepts or practical examples, or point to something well established that does. The simple, self-evident fact that IQ is fit to a normal curve and you yourself don't seem to believe that a symmetric 15 point gap is equal across the domain is in and of itself a tacit admission that IQ is the wrong tool. Are you familiar with the statistical notions of how an assigned number scale can be nominal, or ordinal, or interval, or ratio? It's not a perfect paradigm by any means, but it's one you must grapple with at least on some level, and happens to be incredibly relevant here in this case. See also OP's initial claim that the distribution has a weird asymmetric tail, also evidence (though more mild) against using IQ as the correct tool. Similarly, the fact that you dodge the 100-center question, which is a fundamentally important question to the use of IQ, is not acceptable.
I mean, I get the whole all models are wrong but some are useful, but these are just the very basics, the fundamentals, they are not nitpicks. An example of something that at least does attempt to address these issues and mostly succeeds is the Likert scale. You might be familiar with it. It's the classic 5 or 7 point scale in response to a question, with "strongly agree" and "slightly agree" and "not sure" and disagree options. There's a natural zero, and at least psychologists attempt to say that the distance between each point is "equal". I know forced normalization distorts this equal-distance formulation slightly, in terms of the math, but two properties that persist across the transformation are the aforementioned symmetry of responses, and also the center point of responses. These two decisions are non-negotiable and mandatory to make and cannot be hand-waved away. They are inherent to the math and the use of a numerical model.
Imagine two groups of children go to a themepark and want to hop onto a rollercoaster, which has a minimum height requirement of 105cm. One group of children has heights that range from 110cm to 150cm, and the other group has heights that range from 70cm to 110cm. The symmetric 40cm gap would not be equal across the domain - is this a tacit admission that height is the wrong measuring tool for the job? A simple 15cm boost would have a different effect on each group's ability to ride the rollercoaster, so how can you say that 1cm is equal to 1cm between the two groups?
This is why a statistics background is helpful. The core idea behind creating an IQ score is this: Raw test scores are forcefully molded into something that looks like a bell curve. That's IQ generation. That's the analogy here of "slapping a number on it". To be clear, anyone can take any dataset ever and make it look like a Bell curve by following this same methodology.
Careful! The thing being measured is by no means required to have a normal distribution itself! Height is actually a bad example here, because we know that due to whatever mechanisms go into a person's adult height, that human population heights are actually approximately normal (I say approximately because technically the normal has an infinite domain, and in practice we never see humans beyond a certain min and max height, but the core part of the distribution is without a doubt very normal; tails beyond a certain number of standard deviations are not as often considered, and are generally not here either for our purposes). In our height example, the difference in both a raw height of 1 cm is the same as a "normal" height of 1 cm. However, in IQ, if you score 1 point different in the raw test data, this could translate to a .5 IQ or a 2 IQ difference depending on where your particular score was forced into a normal distribution, i.e. how far up or down you are, and vice-versa. As I said, it's not symmetric.
Choosing height as your example is actually perfect, then, because it demonstrates that you indeed do not understand IQ on a fundamental level.
So IQ is necessarily ordinal in the sense that the mechanism is ranking and stacking up test-takers, relative to some benchmark. But they never are interval (implying equal-measures) in the sense that neither the core, raw test scores nor IQ are necessarily going to fairly represent what we actually want it to be: intelligence. A misunderstanding betrayed in everything upthread. It gets worse, too, when you consider that most IQ test designers have deliberately messed with the test design to make the test results fit their nice bell curve easier. You can see how this leads to some circular logic and reasoning. This is a MATH ISSUE. You cannot hand-wave it away!
For more, please see for example a technical discussion here, with an excerpt:
That's a lot of words but I think I may not have been sufficiently clear when making my point because this reply doesn't get at the core of my objection, which doesn't have anything to do with the distribution of the score. I'm aware that height doesn't follow the same distribution curves as IQ, but the point of using height was to make the concept of a threshold or minimum requirement more obvious.
The point being made by your interlocutor is not that the 15 points of IQ between 100 and 115 matter more than the 15 between 85 and 100, but that it can be harder to tell the difference externally. To wit:
A single casual conversation can give you enough information to determine whether or not someone meets a certain low threshold for IQ, in much the same way that a sign in front of a rollercoaster with a single black line at the height threshold can tell you if someone meets the minimum requirement or not. The fact that the single threshold of the sign gives you a bit of information about the height of people who compare themselves to it but is unable to give you more information about the distribution of heights among people who pass does not mean that a centimetre is measured differently above or below the threshold.
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Funny, I don't think I do. What I think is that we have a testable metric which at the population level correlates reliably and meaningfully with both racial groupings and life outcomes, that this fact has substantial explanatory power, and that these correlations will persist regardless of what you think of that metric.
What I think is that fifty or sixty years of failed racial uplift will in due time turn into seventy, and then eighty, and then ninety, a hundred, so on and so forth indefinitely, barring the apocalypse or some sort of massive sci-fi technological intervention. I think that when you and I are both dead from old age, the exact same group will still be hopelessly behind, and someone somewhere will still be doing this exact same tap dance.
They'll still be just as eager to repeat how racial categories can have fuzzy boundaries, still ever so philosophically uncertain of the value of IQ as a metric. But that uncertainty will never allow them to raise a proportionately equal share of brain surgeons, or what have you, from the population at the bottom of the ranking.
Funny, yes you do. That's literally how using statistics and math to evaluate social problems works. You can't just slap a number system onto something and call it good. That's Stats 101. Even some more advanced numerical analysis can sometimes reach the literal opposite conclusion if done or designed incorrectly. On that same note, explanatory power is also insufficient if your categories are fundamentally flawed. Why? Because what you want to do with your model matters. Even if you are trying to be predictive vs just descriptive of the past changes some potentially vital assumptions. It's, mathematically, just wild to vigorously defend arbitrary categories that have demonstrated flawed mechanisms and so-so generalizability just because it happens to kind of work as an explanation. That's not rigor, it's agenda, quite frankly. And we are talking about IQ as a tool, and you defend it based on... some non-sequiter argument about how people in charge are ignoring it or something?
You can hand-wave away the fuzzy boundary problem all you want in an observational sense, but it actually matters a lot (this is underselling it, it's literally foundational) IF you want to use IQ as a tool of making actual proscriptive, "do this and not this" kind of arguments based on what it tells you. Such as exhibit A: do we continue, change, intensify, stop, etc. "racial uplift" efforts?
I additionally think, as a factual matter, claiming that all efforts to help Black people in the last 50-60 years have failed is a pretty wild and weakly supported take. As far as I know the proportional wealth gap for example stalled out more in the 1980s or so, so 45 years, but your language seems to imply this is a more longstanding. Perhaps a more useful question I have for you then would be, at what point historically do you think things presumably got 'fair enough' that you can say "well we tried and failed so it must be their fault not ours"? I assume that is your actual argument, yes? That we as a society tried and failed at "racial uplift" and no use throwing good money after bad, that kind of thing?
My grandpa told me a story last year about how while he was growing up his dad decided to quit being a realtor because he was so mad at the realtor's association refusing to allow him to sell a house to a nice, well-off Asian couple the house they wanted because of explicit redlining. He was willing to go to bat for them and fight it and they just gave up. Redlining for example only became technically illegal in 1968 and sure as hell didn't magically stop overnight. You know, the main way Americans build generational wealth. Sound familiar? Don't get me wrong, there's sure a limit to assistance, and personally I favor a more, well not entirely race-blind approach, but certainly a more targeted approach that mainly focuses on wealth as it is rather than other groupings.
Have you ever tried looking up achievement scores controlled for both race and income? The results are pretty gruesome across the board. Even if you completely leave aside all but the wealthiest blacks, you're left with a group that can compete with only the very poorest whites, while being crushed outright by even the most poverty-stricken Asians.
From an HBD point of view this is all totally unsurprising, but the other side is perpetually left scrambling for some kind of bullshit mini structural micro systemic racism that makes the family of a wealthy black doctor worse off than that of the Asian immigrant who scrubs their shitter for them. It's horseshit. It's a bad joke, and I don't need to fuck around in the weeds over statistical methodology to call it a joke.
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Not that I disagree, just want to make sure we're on the same page: the way I see it you just doused every single social science with gasoline, and are standing above them with a lit match in your hand. I don't mind getting rid of the HBD hypothesis this way, but I want to make sure that when the whole thing is done, you're not going to try and tell me that that little pile of ashes where "implicit bias" used to stand, is still a valid structure.
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Lewis Terman (of Stanford-Binet fame) and his many successors (and predecessors) have done that. IQ isn't some crank idea.
The reason for this belief was explained; you've ignored the explanation. If you're just e.g. having casual conversation with someone, you may well not be able to detect someone at 100 from someone at 115, but could detect someone at 100 from someone at 85. This does not at all mean there's something unequal about IQ. It just means such casual conversation is not particularly intellectually taxing. The symmetry you claim must exist is not, in fact, a requirement.
As for "nominal, ordinal, interval, ratio", the Wikipedia page on that actually cites IQ as an example of an ordinal measurement, though I am not sure Terman would agree.
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Right but it feels like you're assuming that somehow white people have no gains to be made. I think that assumption would fail on the same grounds you would fail those who presume that blacks have no gains to be made.
I'd argue that in the developed world, nobody has any gains to be made. We've removed lead from gasoline, famine and malnutrition are distant memories. In terms of IQ, we've picked all the low-hanging fruit. If there was a way to actually increase a child's IQ beyond avoiding stressors like malnutrition or poisoning, the tiger mothers and educational establishment would have found it by now.
I don't disagree. I just think it's easier to argue the point that there is no stated upper limit given by folks that argue what MaiqTheTrue argues. Since their position, in my experience of arguing against similar ones, is ultimately not based on objective thinking or anything related to the real world but rather moral preference.
When you push motivated egalitarians far enough they will simply resort to impossible to prove theories and assumptions, be that prenatal environment, systemic racism or whatever else. It's much quicker to simply ask them why they expect all of their confounding factors that can never be tested to only be able to affect black people. It helps highlight how the proposition that we could possibly increase IQ doesn't do much for equality.
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