Crémieux Profile picture
Jan 8, 2024 • 10 tweets • 3 min read • Read on X
Achievement gaps do not simply reflect geographic sorting.

This fact has been known for more than a century now, but some people still don't get it.

Short🧵

First: achievement gaps exist within the same schools.Image
This is not just true for race, it is also true for class. Image
When it comes to district-level family incomes by group, we see that intercepts differ.

In other words, even when lower-performing groups are wealthier, they tend to do worse than higher-performing groups. Image
If you're reading this, you probably know that this replicates the results for rearing household income (1/3):
Consider Reardon, Kalogrides & Shores (2019). They found that even in districts where lower-performing groups had higher SES than Whites, they still tended to perform worse.

In this picture, 79% of the mean Black-White gap is independent of SES. At the metro level, 62% was. Image
It is a pernicious myth that test scores and achievement gaps are mere reflections of geography and that geography plays a major causal role in test scores.

The truth is that their association primarily reflects selection.
I neglected to mention this: results from Moving to Opportunity suggest no significant effects on test scores.

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More from @cremieuxrecueil

Mar 31
I just updated one of my articles a second time.

It has to do with Justice Jackson's comments that when Black newborns are delivered by Black doctors, they're much more likely to survive, justifying racially discriminatory admissions.

We now know the study contained fraud🧵 Image
The original article claimed that, when Black babies are attended to by Black physicians, their infant mortality rates decline substantially relative to when they have a White physician.

Justice Jackson cited this in the Supreme Court, even though it was implausible. Image
A few months back, we learned that the original finding was driven by the authors failing to include a required control variable.

Not only that, but they seemingly knew they this variable was important.

Read 13 tweets
Mar 30
Thread of natural sources of different medications.

We can thank the Gila Monster for modern GLP-1 drugs like Ozempic Image
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Ziconotide is a powerful non-opioid painkiller used by people who have severe chronic pain that's resistant to other forms of treatment.

It was discovered in the venom of killer Cone Snails. Image
Image
Trabectedin is a chemotherapy drug that was isolated from an extract of sea squirts. Image
Image
Read 19 tweets
Mar 30
In case it's unclear, I think the mechanism here is likely to be preferentially enlarging productive firms.

In more competitive economies, more productive firms have larger market shares🧵

America is a stand-out example of this: Image
Prior to the fall of the Iron Curtain, markets in Eastern Europe were remarkably inefficient.

After its fall, market reforms occurred, and after they took place, they went from less efficient firms capturing larger market shares to the opposite: more efficient firms dominated! Image
The thesis is this:

America's stock markets are set up in a way that, incidentally, promotes more efficient firms capturing larger market shares.

There's not yet enough data to know if this is true, but time will tell if this possibility holds up.
Read 4 tweets
Mar 22
WHAT IF

@nyuniversity didn't engage in blatant racial discrimination when they were selecting the Class of 2028? The result would be

- Much higher average SAT scores
- Minimal racial differences
- Very different student demographics Image
Instead, the NYU we get is far more "diverse" than it has any right to be, because the admissions officers had their fingers on the scale.

We know what unbiased admissions would look like, and it's not this.

They're going to fall back on excuses, but nothing will work.
Their defenders might argue Asians do fewer or worse extracurriculars. The opposite is true.

Their defenders may argue Asians have worse personalities. They don't gather that data and it would be biased. Next?

They could argue Asians do less in athletics. OK, but small effect.
Read 7 tweets
Mar 22
Even when men and women are matched for the amount of muscle they have, men tend to be far stronger.

The case against sex-segregating sporting is the case for women only making appearances in sports with relatively equal performance, like archery. Image
This is true for the lower body too. Image
Elite female athletes even tend to be weaker than typical men.

The case against sex-segregated sporting is very clearly the case for eliminating women's participation in sport. Image
Read 5 tweets
Mar 22
We now know NYU violated the law by engaging in racial discrimination in their latest admissions cohort.

They should be punished severely.

In the meantime, NYU should also try to make amends by contacting all overlooked students and sending them admissions offers right now.Image
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This data comes from today's hack of NYU's admissions department and website.

You can see an archive of what their website looked like an hour ago here: web.archive.org/web/2025032213…
Now, as a reminder, Trump has stated that his preferred punishment for universities that continue to engage in illegal racial discrimination is...

Confiscating their endowments, taking away their accreditation, and imposing severe damages on those responsible.

Godspeed. Image
Read 4 tweets

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