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Culture War Roundup for the week of November 27, 2023

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The Dunning-Kruger effect is autocorrelation

Huh. I can only apologize for the relatively bare link, but I feel like it's worth drawing attention to something so widely accepted yet utterly worthless, especially when it comes up so often here.

The thing about the DK effect is that it makes intuitive sense. To extend it past the realm of typical human intelligence, an ant or a chimp isn't very good at knowing how dumb they are because they're not very good at most things. However, I suspect that the average dumb (human) person does know they're a bit dim, so it confuses me how this finding can even arise.

The problem with the Dunning-Kruger chart is that it violates a fundamental principle in statistics. If you’re going to correlate two sets of data, they must be measured independently. In the Dunning-Kruger chart, this principle gets violated. The chart mixes test score into both axes, giving rise to autocorrelation.

Realizing this mistake, Edward Nuhfer and colleagues asked an interesting question: what happens to the Dunning-Kruger effect if it is measured in a way that is statistically valid? According to Nuhfer’s evidence, the answer is that the effect disappears.

Is it possible to salvage a non-trivial version of the DKE? The one we know and once loved literally works for random data, so that's right out. In other words, what's the cut-off where a stupid person becomes smart enough to know they're stupid, or at least worse than their peers?*

*In a more general sense than a chimp knowing he's not as strong or big as the alpha male.

So so much of pop science is utter garbage that it is amazing it ever got the reach it did.

Another example is the "human brains don't mature until 25" BS, where even the authors of the original paper from where this statement comes from don't agree with it and are surprised that this, out of all the claims in the paper, was the takeaway which entered public consciousness...

Another of my most hated ones is the idea that only 7% of meaning comes from words (the rest from body language and tone). This doesn't even make any fucking sense, much less have any evidence that it's true. It's a terrible description (like, you'd have to be borderline-illiterate to go to the original source and have this as your takeaway) of a study that was making a completely different, much narrower point. (Specifically, that if your verbal and nonverbal communication don't match, people will generally believe the nonverbal portion - e.g. you say to your spouse "everything's fine!" in an angry, aggressive tone, this will not persuade them that everything's fine.)

Thinking for ten seconds about the last non-trivial conversation you had (roughly speaking, one where novel information was exchanged on a topic other than the participants' current emotional states) should be enough to disprove this idea decisively. How, you should ask yourself, could 93% of that information have been exchanged in a way that was independent of the words used? In most cases, you will find that the question not only does not have a good answer, but is hard to even make sense of.

This has not prevented the idea from showing up in training materials from major multinational corporations, not to mention the Web sites of universities that should damn well know better.

Thinking for ten seconds about the last non-trivial conversation you had (roughly speaking, one where novel information was exchanged on a topic other than the participants' current emotional states) should be enough to disprove this idea decisively.

Yeah, this seems absolutely impossible to believe. The information content of someone telling me, "I would like pizza for dinner" via text message is almost identical to them saying the same thing face-to-face. I might glean some additional information about their enthusiasm for said pizza in the latter case, but that's the 7% rather than the 93%. I'm not familiar with the study, but it sure seems like it's just a measurement of a claim that everyone already believes, which is that words aren't great at overriding non-verbal signals that are generally more honest when the two are contradictory.