Kareem Carr, Statistics Person Profile picture
Stats PhD student @Harvard • I'm on a mission to Make Twitter Nerdy Again • Follow me for a steady stream of nerdy content on your timeline.
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Jan 23 6 tweets 2 min read
This is a resource thread about the Datasaurus Dozen data and how to get it.

The Datasaurus Dozen is a collection of extremely different datasets with near identical summary statistics.

It’s a reminder to all of us to ALWAYS plot our data. Here’s what all the datasets look like: Image
Jan 20 11 tweets 3 min read
Nassim Taleb has written a devastatingly strong critique of IQ, but since he writes at such a technical level, his most powerful insights are being missed.

Let me explain just one of them. 🧵 Image Taleb raises an intriguing question: what if IQ isn't measuring intelligence at all, but instead merely detecting the many ways in which things can go wrong with a brain?
Jan 15 4 tweets 1 min read
Here's something counterintuitive, that a lot of people don't understand about heritability as it relates to race, if skin color is heritable, and discrimination based on skin color is common, the bad outcomes due to racism is going to be heritable as well. Whenever you get any race-related heritability numbers, the first thing you absolutely should do is ask the person giving you those numbers what they did to rule these pathways out as a possibility.
Jan 15 7 tweets 2 min read
hey now, this is the guy that said your tweet was racist. go yell at him not me. Image Let me break this down. The original tweet is doing the statistical equivalent of this. Image
Jan 13 10 tweets 2 min read
It feels racist because it’s a white nationalist framing of these data. This is a textbook example of how to lie with statistics. Image My main criticism is he didn't even provide a source. So, 100k+ people have seen this and we don't even know if there is any real data here.
Dec 30, 2024 8 tweets 2 min read
According to a recent paper, the vast majority of academics gain their elite status the old-fashioned way, they were born with rich parents. Image Academics are more likely to have rich parents than teachers, lawyers and judges, and even physicians and surgeons. Image
Dec 16, 2024 16 tweets 2 min read
Race and IQ research tends to be really bad. Here's why: Image To say IQ is "genetic" is to say it operates at the level of genes.
Dec 15, 2024 19 tweets 3 min read
I have debunked this map of global IQs, and the study it was based on, so many times, but it just won't die. Help me spread the word about how much this study sucks. For every 10 likes, I will tweet a ridiculous fact about how badly this study was conducted. Real science is about paying close attention to the quality of your sources. Notice that the original poster doesn't bother to say where the data comes from.
Nov 24, 2024 5 tweets 1 min read
It's actually incredibly bad that X downranks posts with links. It's perverse that supporting your claims with an external source makes it less likely people will see your post which is the exact opposite of what you'd ideally want in a truth-seeking forum. Sure you can put the link in the next post but very few people see the second post compared to the first. I also suspect that they downrank threads that have links in them just not as much when it's in the first post.
Nov 11, 2024 4 tweets 1 min read
Here is a problem I see with modern liberalism: if you tell a certain kind of liberal that there are two kids drowning and that they can only save one, they would immediately declare that they can save them both, and then act completely surprised when both drown shortly after. If that same liberal could magically go back in time with all the knowledge of what had happened, that person would do the exact same thing again, and then be just as surprised when both kids drowned for the second time.
Nov 10, 2024 6 tweets 2 min read
People are getting the wrong end of the stick here. Nobody stopped her from experimenting on herself. The hold up is on *publishing* the results. Here's the quote from the article Image
Nov 9, 2024 10 tweets 2 min read
I honestly get a lot of value out of ChatGPT. It feels built for people like me. I find identifying and correcting its mistakes pretty easy because I'm used to grading student assignments, but I also do things that minimize mistakes like: I input:
- examples of past solutions to similar problems
- a high-level sketch of the solution to the current problem
- background information if needed
- warnings about any potential complications or pitfalls
Nov 5, 2024 7 tweets 2 min read
This Musk meme speaks to something true which is America is splitting culturally between the college educated vs the non-college educated.

There is however a third group. People who went to college but who think and act like people who didn’t. Image Basically you have these people who went to elite schools like Harvard or Stanford or Yale, who have law degrees and doctorates in many cases, telling the non-college educated that there’s no point to college because it’s not great job training.
Oct 24, 2024 4 tweets 1 min read
there is clearly a force or mechanism that causes the US electorate to balance at precisely 50% democrat 50% republican no matter what either candidate says or does.

if i was a social scientist, i would be absolutely obsessed with this. my economics brain says maybe it's that each party is more extreme than the general electorate and is only willing to concede the minimum number of policies necessary to win which is exactly 50% + 1 vote.

this leads to a powerful finetuning mechanism on both sides.
Oct 18, 2024 6 tweets 2 min read
For every ten likes, I'll post a new unhinged mathematician quote. Image if it's you or logical consistency, you know which one they're picking. Image
Sep 11, 2024 4 tweets 1 min read
This common criticism of Nate Silver's methods represents a deep misunderstanding of statistical modeling. 🧵 Image We *should* be representing the outcome of the election as a probability because the outcome is *inherently* uncertain, and probabilities are how we communicate that scientifically.
Aug 12, 2024 7 tweets 2 min read
One of the things I hate most about the cult of IQ is it leads to lot of magical thinking about how the brain works. There’s absolutely nothing shameful about relearning things you use to know. Image Research shows forgetting is a normal part of human cognition. Image
Aug 9, 2024 12 tweets 3 min read
How to convince a skeptical colleague that you're right and they're wrong (thread) Image STEP 1: Show respect for their point of view by making a good faith effort to understand what they're doing and how it compares to your approach
Aug 5, 2024 10 tweets 2 min read
Infographics of this dataset have been kicking around on the internet for years. It is an insult to real scientists everywhere. For every 10 likes, I will post a new ridiculous fact about how fake and ridiculous this "data" is. They report data on 185 countries but *104* of those numbers (more than half!) are based on *zero* data collected from people from that country. ZERO.

Rather than acknowledge this lack of data, they decided to guessimate based on surrounding countries.
Jun 26, 2024 8 tweets 2 min read
People are getting thousands of likes for spreading this misinformation about sex differences. Let me explain why this interpretation of the data is wrong. 🧵 Image If you think 100% accuracy is too good to be true, trust your instincts.

The version of the model shown in the plot was basically fed the sex of the participants. That’s why it’s achieving 100% accuracy. Image
May 10, 2024 12 tweets 3 min read
I keep seeing this Huberman clip all over my timeline so let’s use it as teachable moment to learn some statistics. The basic mistake is not taking the people who are already pregnant out of the pool of people who could be pregnant the next month. Of the starting 100, fewer and fewer will remain each month. Image