Norman Topping Chair in Medicine & Public Policy, USC, Sol Price School of Public Policy
Los Angeles, CA
Joined August 2014
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This is why we need TWFE difference-in-differences analysis.
"It's like we shoot at the side of a barn and then draw a bullseye around the bullet hole."
That right there kids is called "researcher degrees of freedom."
Perception is filtered through discrimination. The weak orders commonly used in econ are, in practice, semi-orders--indifference is intransitive. "Shrinkflation" capitalizes on semiorders as do add ons at the point of sale, and price creep, and platform decay online.
Jason Doctor retweeted
The most important briefings of the day.
Karl Deisseroth, professor of bioengineering and of psychiatry and behavioral sciences, shares the news of his Nobel Prize with his kids.
[@ben_golub ]: Are eigenvalues involved?
[narrator]: Eigenvalues are the primary tool used to decide how many components to keep for the final regression stage.
[@ben_golub ]: I like it!
I sometimes think about Vonnegut's "Ice-9," now a cautionary tale about madness and instability in a world where intelligence could run wild. Maybe like water in that book, intelligence is "metastable"; a small advance keeps the world the same(2), but a large one destroys it (3).
Writing can involve descriptions of introspection, feelings and states of being that are not relevant to conversation or debate. Therefore, writing is essential to thinking.
Jason Doctor retweeted
We have thousands of years of religious, philosophical, and legal traditions trying to “align” humans and make our behavior “safe.”
Now we’re trying to speed-run toward those goals with AI.
As we have often failed with humans, we should expect and plan for failures with AI.
Christopher Guest but instead of naming nuts he is naming leadership roles at journals: "Editor, Deputy Editor, Associate Editor, Assistant Editor, Guest Editor..."
Jason Doctor retweeted
If you’re young, one of the main ways you can add value at work is by taking advantage of a lack of family responsibilities to just take annoying shit on and be helpful.
slowboring.com/p/feed-the-li…
This is a good example of the psychology of risk perception. Two factors predict high-risk judgments: "dreadfulness" and "uncontrollability." Plane crashes are dreadful and uncontrollable, but air travel is safe. You don't control the Waymo; driving seems safer, but it is not.
I'd say it is relevant :P(patient alive X yrs) uses measure theory. Time of death has infinite points. So we must break it up into a countably infinite disjoint point sets. Lebesgue measure has no countably additive extension to all subsets of the reals. Hence, measure theory.
Jason Doctor retweeted
“The worst possible way to find out a new drug is in the city is by an autopsy,” Humphreys said.
sfist.com/2026/09/14/victim-…
I kind of agree . Singular points have empirical meaning fixed points are a trick to prove a theorem. Every singular point is a fixed point of every automorphism. But, not every fixed point is a singular point.
In prospect theory for example, the status quo is a singular point.
A fixed point theorem proves that one map sends at least one point to itself. This is not anything to do with the theory, just a math fact that can help get a proof to the finish line.