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Crémieux Profile picture
@cremieuxrecueil
Jul 13 • 4 tweets • 2 min read • Read on X
There are already mentally retarded PhDs.
Image
Education has become less selective as more people have enrolled. It's a statistical necessity, so it's no surprise this has happened: Image
Sources in: cremieux.xyz/p/education-is…
I notice some people are confused by the term "mentally retarded". I'm using it in the common, incorrect way in the OP. Having an IQ <=70 is not mental retardation on its own.

And yes, there are datasets with PhDs who have clocked 70.

For more info, see:

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More from @cremieuxrecueil

Crémieux Profile picture
Jul 14
A new meta-analysis of group differences in measured IQs in Britain has been published.

Here are the results: Image
Here's a condensed version that just uses major groups and has 95% CIs. Image
Whites were the baseline (mean = 100, SD = 15) and equal variances were assumed. Splitting Whites into British (-0.01 d), Irish (0.02 d) and "White Other" (0.04) wouldn't change much.
Read 6 tweets
Crémieux Profile picture
Jul 12
One study estimated that being exposed to Ramadan in utero reduced the test scores of six-year-old Muslims by up to about 1 IQ point. Image
Ramadan involves intermittent dry fasting during the daylight hours for 29-30 days.

Opinions vary, but most will accept that pregnant women are not required to fast, and even more will agree that they are allowed to drink water.

Nevertheless, many Muslim women strictly adhere.
Whether this sort of fasting is harmful to pregnant women is contentious, precisely because there are some who believe women ought to do it for religious reasons.

So there are bad incentives here.
Read 15 tweets
Crémieux Profile picture
Jul 11
The Economist has a new article out today on boosting global IQ.

It starts off in error: stating that the Flynn effect means people today are smarter than people in previous generations.

So, I'm making an article that's been in my drafts for months available to subscribers🧵 Image
The full post will come out pared down later, in a different publication. This long version is just for paid subscribers

It explains

1. Why the Flynn effect has not indicated rising intelligence
2. Why it is irrelevant for group differences
3. Why it's not easy to adjust for it
What, ultimately, explains the Flynn effect?

The most consistent thing is test bias. The next thing is nothing, because the Flynn effect is not one thing, it is many factors that principally cause the interpretations of rather than the constructs underlying tests to change.Image
Read 4 tweets
Crémieux Profile picture
Jul 10
Is hiring in engineering sexist?

Do women who get offers for engineering roles get offered lower salaries due to their sex?

Thanks to the hiring platform Hired, we might know the answer! Image
Hired was an online recruitment platform for full-time engineering jobs in the U.S. It had high average wages (low six figure) and its recruitment process looked like this: Image
The salaries candidates asked for were public. The salaries companies offered (bid salaries) were given based on said asks. About a third of those bids were the asks, and most of them were close.

Their high correlation means job candidates generally got ~what they asked for.Image
Read 18 tweets
Crémieux Profile picture
Jul 4
Why are the kids scoring poorly today?

Uh, high ceilings.

This study is making the news, but it is bad🧵 Image
To start, note that multiple outlets have reported that this study provided evidence that the higher the ceiling of the test-taking environment, the lower the exam scores.

Thus, 'Your poor performance might not be your fault. It's the fault of the ceilings!' Image
Spoiler: if you download the data, you find that the correlation is -0.0423.

You could say "Oh, the effect is small, but it could matter."

But wait a second.
Read 40 tweets
Crémieux Profile picture
Jul 3
Have you ever wondered why the east sides of many British cities are such awful places to live?🧵

It might be related to these guys: Image
Those are chimney sweeps. Not real chimney sweeps, mind you; they're from the movie Mary Poppins.

In the real world, chimney sweeps were often a bit dirtier, with good reason. Chimneys were dirty. They bellowed smoke and made the world around them look dreary.Image
The worst offenders were industrial chimneys.

When the Industrial Revolution came about, coal consumption skyrocketed, making British cities incredibly dirty, because its use was putting out tons and tons of smoke, pollution, and ash through said chimneys. Image
Read 16 tweets

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