Dean Eckles
banner
eckles.bsky.social
Dean Eckles
@eckles.bsky.social

networks, contagion, causality
faculty at MIT

Mathematics 19%
Physics 19%

Reposted by Dean Eckles

Ed, you’ve looked at NVIDA very closely lately and given really good information. Is there any plan to do the same scrutiny on Google and its ai efforts? Google seems to be the only mag 7 company that isn’t circular financing NVIDA and seems to be the company Altman is most concerned about now
“From the night of the massacre onward, Ms. Fletcher was never again able to sleep comfortably in a bed, she wrote…
“When I sleep, it is never very deep or for very long because of the anxiety and the things I see,” she wrote. “Imagine having the same horrible nightmare every night for 100 years.”
Viola Fletcher, Oldest Survivor of the Tulsa Race Massacre, Dies at 111
www.nytimes.com

You've generated an example to haunt diff-in-diff believers

And it would be even more credible imo without the gap, even if it looks approximately additive

OK but maybe you find the point persuasive that past coverage of internal research has been actively misleading about what we can conclude from it, so we might want to cautiously interpret new claims about what such research shows

I'm a big fan of actually plotting unnormalized trends of the treated and control groups. So often diff-in-diff is leaning really heavily on parametric assumptions to extrapolate. cf statmodeling.stat.columbia.edu/2023/08/22/t...
thefacebook and mental health trends: Harvard and Suffolk County Community College | Statistical Modeling, Causal Inference, and Social Science
statmodeling.stat.columbia.edu

The cited survey data had more teen girls saying
Instagram made them feel better than worse...

Would be interested to learn more... Like this prior headline was based on research that was quite ambivalent.

Maybe useful to compare with papers.ssrn.com/sol3/papers.... which does have some discussion of effects you might expect under different, changing economic conditions

Looking at the time series, this looks more credible than many difference-in-differences analyses.

So a good reminder that causal inference is hard — especially with a single treated unit.

Also, showing the non-scaled ZORI would probably reveal the parametric extrapolation diff-in-diff does here.
I think this is mostly San Francisco finally shrugging off the pandemic, but it is *really* funny that rent prices in San Francisco shot up *immediately* after the city banned RealPage and other algorithmic price setting software.

My pre trends are incredible!

Reposted by Dean Eckles

I think this is mostly San Francisco finally shrugging off the pandemic, but it is *really* funny that rent prices in San Francisco shot up *immediately* after the city banned RealPage and other algorithmic price setting software.

My pre trends are incredible!
If you're trying to convince your friends to spend time on Bluesky rather than X, maybe show them this. X is not "the public town square" or about "free speech." It's "just what Elon Musk wants you to see." If you see stuff he doesn't like he'll step in to make sure you don't see it for long.
If you scroll on X, you are only being shown what Elon wants you to see. If you create content on X, no one will see it unless Elon wants them to.
ICE’s Detention Center outside Chicago was sued on October 30 for allegedly abusing detainees. One day later, a "system crash" lost all video footage that could have shown how detainees were being treated. trib.al/QwT3aqI
THREAD: Judge Ellis is the first federal judge to review extensive body cam video of DHS's actions in Chicago. She finds that DHS *repeatedly* misled the public and made claims that were disproven by agents' own videos.

I'll go through some of the most egregious ones here.

"People buy GPUs like they buy eggs. You don't buy just one."

Reposted by Dean Eckles

Factor analysis and varimax have been widely misunderstood among statisticians. Two years ago, Muzhe Zeng and I had a discussion paper at JRSS-B that tried to clarify why factor analysis and varimax were actually decades ahead of their time

It’s free (with discussion) here:
doi.org/10.1093/jrss...
Vintage factor analysis with Varimax performs statistical inference
Abstract. In the 1930s, Psychologists began developing Multiple-Factor Analysis to decompose multivariate data into a small number of interpretable factors
doi.org
RFK Jr had committed to Bill Cassidy, as a condition to win his vote, that he would keep website language.

Cassidy in February: “If confirmed… CDC will not remove statements on their website pointing out that vaccines do not cause autism.”

Note the language in second photo.
Amazon sues Perplexity over their agentic browser Comet using Amazon to make purchases for users. Might be an interesting case to keep an eye on www.theguardian.com/technology/2...
Amazon vs Perplexity: the AI agent war has arrived
A lawsuit over automated shopping reveals a deeper struggle over who will control the next generation of AI and what happens when autonomous agents start acting on our behalf
www.theguardian.com
Just wanna re-up in simple terms that when Biden talked to platforms, Jim Jordan launched years of investigations into everybody involved, said it was tyranny, censorship, etc.

And now they just straight up acknowledge that they talk to platforms too.

www.washingtonexaminer.com/news/crime/3...
DHS playing 'whack-a-mole' shooting down made-up ICE stories
The Department of Homeland Security is stepping up efforts to combat fake news, viral AI videos, and misinformation on ICE and Border Patrol.
www.washingtonexaminer.com
The actual secret to why I know stuff is that I ask a question any time I don’t understand literally anything. I don’t care how simple it is. Anybody who makes fun of you for asking a simple question likely doesn’t know the answer either

Reposted by Dean Eckles

For household surveys that only collect householder information (e.g. the SCF, HVS), claims like "Millennials are doing better than previous generations" are just picking up increasingly positively selected householders if household formation differs across generations and is related to resources

Reposted by Dean Eckles

From my colleague; paper here dropbox.com/scl/fi/55uok...
new paper by Sean Westwood:

With current technology, it is impossible to tell whether survey respondents are real or bots. Among other things, makes it easy for bad actors to manipulate outcomes. No good news here for the future of online-based survey research

I think back to this research on Lajos Simicska's purchase of a major news outlet (and then his later falling out with Orbán) and how this is hugely reflected in advertising buys by the state
doi.org/10.3982/ECTA... @ecmaeditors.bsky.social

Cheeky FT commentary...
on.ft.com/4o5S3Yf

Reposted by Dean Eckles

We’re currently on a mini-vacation in an indoor water park in a giant hall in the middle of nowhere where they initially planned to build cargo airships. It’s quite nice but the vibes are def apocalyptic. The earth has become inhabitable & we’re all stuck under this giant dome at 26 degrees celsius.
When former Harvard President Lawrence H. Summers was pursuing a romantic relationship with a woman he described as a mentee, he turned to a longtime associate for guidance: Jeffrey E. Epstein.

Dhruv T. Patel and Cam N. Srivastava report.
As Summers Sought Clandestine Relationship With Woman He Called a Mentee, Epstein Was His ‘Wing Man’ | News | The Harvard Crimson
When former Harvard President Lawrence H. Summers was pursuing a romantic relationship with a woman he described as a mentee, he turned to a longtime associate for guidance: convicted sex offender…
www.thecrimson.com

Modest forbids recommending
www.pnas.org/doi/10.1073/...
(But there is an associated data set, which maybe is of interest)
PNAS
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...
www.pnas.org
The cost of Trump's immigration surge: Stalled investigations into child sexual abuse, Iranian oil smuggling and human trafficking, among others. My latest piece is a big team effort on how DHS has been transformed into the Department of Deportation.

Gift link: www.nytimes.com/2025/11/16/u...
Homeland Security Missions Falter Amid Focus on Deportations
www.nytimes.com
Very cool post, thanks for finding our initial paper on this issue interesting. Turns out we had another one just out, where we extend the idea of critical ignoring and relate it to the detrimental consequences of information overload: doi.org/10.1016/j.co... 1/n