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Ari B Friedman

@abfriedman.com

554 Following7k Followers

This is my personal account. Faculty at UPenn. Emergency doc, health economist, geriatrics and privacy researcher. Views are my own. RT does not imply endorsement.

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@abfriedman.comOct 4, 2026, 1:26 PM

If you're not following Phillips P O'Brien you should. His background as a preeminent historian of strategy and economics of WWII, his moral clarity, and his realism have made him right about at startling number of things since the start of the most recent invasion of Ukraine.

@phillipspobrien.bsky.socialOct 4, 2026, 7:36 AMReposted by @abfriedman.com

Free weekend update is out. Russia has a strategy for this winter--massive war crimes to make Ukraine unlivable. We need to speak the truth on that. One reason they need to do this is that they are struggling in other parts of the war--see Vivaldi. phillipspobrien.substack.com/p/weekend-up...

@abfriedman.comOct 2, 2026, 5:22 PM

That's useful! And they can do some remarkable things. But the cost of un-entrustable code is very high. Here's an obvious mistake one just made on some basic data cleaning. Can you spot the error?

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@abfriedman.comOct 2, 2026, 5:22 PM

I'm truly shocked by all the claims that LLMs are intelligences or are brilliant at coding. They're useful tools, in some circumstances. But if you gave one a job exam for an entry-level programming job it would fail. LLMs try a strategy, fail, try again, fix the error, try again.

@abfriedman.comOct 2, 2026, 4:36 PM

Apropos of sensitive to minor details, I'm playing with coding with one, and I had previously told it that the ZIP files were redundant with the CSV files in the data folder. Then I asked it to make a patient ZIP code variable and didn't capitalize ZIP. It next asked if it could unzip the files.

@abfriedman.comOct 2, 2026, 4:33 PM

6) Just a predictive model that can interpolate well but can be quite sensitive to order and other minor details. Ask yourself, "Is the conversation I'm trying to predict likely to be anywhere in the training data?"

@abfriedman.comOct 2, 2026, 4:33 PM

4) The cost of generating reasonable-sounding bullshit has gone down way faster than the cost of detecting it. 5) A useful thing that we will figure out more uses for, if we can find applications where false positives and false negatives are acceptable or mitigated.

@abfriedman.comOct 2, 2026, 4:33 PM

2) Plagiarism of all of the world's smart words written by smart humans, and it's remarkable how close anything you could write is to something that's been written before. 3) A model trying to predict the next word that has some remarkable emergent properties.

@abfriedman.comOct 2, 2026, 4:33 PM

Some heuristics that have helped me think about LLMs clearly: 1) The גּוֹלֶם (Golem) myth: words have a power of their own. Write them on a clay figurine and it will imitate a human in certain ways.

@abfriedman.comOct 1, 2026, 10:30 PM

And if you think four hours is long....

jamanetwork.com/journals/jam...

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@abfriedman.comSep 28, 2026, 1:56 PM

@pennldi.bsky.social covers our emerging research in the mechanisms of the harms caused by ED boarding of admitted patients.
ldi.upenn.edu/our-work/res...

Covers multiple articles and joint work with @kitdelgado.bsky.social, Alex Janke, Adrian Haimovich, and the entire resquenet.org collaboration.

@abfriedman.comSep 26, 2026, 6:11 PM

The path to wisdom....

@abfriedman.comSep 25, 2026, 8:04 PM

Jack, you're a treasury of wisdom.

@cervantes-lily1.bsky.socialSep 24, 2026, 4:30 PMReposted by @abfriedman.com

Out today in @jama.com: "On Becoming a Gold Standard Scientist: The Importance of Pilot Clinical Trials.
I was honored to co-author this with Drs. Fesintein, @dramyhuebschmann.bsky.social & @russgl.bsky.social
jamanetwork.com/journals/jam.... @jenna-m-norton.bsky.social @jeremymberg.bsky.social

?Unknown authorSep 20, 2026, 9:07 AMReposted by @abfriedman.com

One of the best examples of age heaping #demography

Smth like this:
- Who else lives in the household?
- Grandpa
- How old is he?
- Ehm... 85

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@propublica.orgSep 20, 2026, 3:00 AMReposted by @abfriedman.com

ProPublica’s analysis of CDC data found that the rate of deaths involving ectopic pregnancies has nearly doubled. The spike alarmed many experts. One said it should “be a never event.”

propublica.orgEctopic Pregnancy Deaths Have Nearly Doubled. It’s Worse in States With Abortion Bans.With prompt and appropriate medical care, experts say, people shouldn’t die from an ectopic pregnancy. Women in Texas and Oklahoma have sued over delays in care, which, coupled with our new analysis, ...
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@abfriedman.comSep 18, 2026, 4:34 PM

@benukert.bsky.social is one of only a handful of scholars to really dig into the empirics of Freestanding EDs, and my understanding of the currents state of the market owes a lot to his work and that of @jschuurmd.bsky.social and his team www.coretalks.org

@abfriedman.comSep 18, 2026, 4:31 PM

I'm therefore really excited about this new editorial, led by Drs. Cedric Dark and George Koshy, where we discuss the potential for FSEDs, when staffed and supplied sufficiently to delivery critical care, to be a critical lifeline in rural areas:

www.sciencedirect.com/science/arti...

@abfriedman.comSep 18, 2026, 4:31 PM

Geography, in this case, is likely destiny: locating in well-served, affluent, dense suburbs leads to delivery of ED services to patients that have less need for them.

@abfriedman.comSep 18, 2026, 4:31 PM

I've therefore long been puzzled by the disconnect between the promise of freestanding EDs and what the literature shows is their current reality: expensive entities that tend to locate in the same sites as urgent cares and do fairly similar work.

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