Juan José Tapia

Bachiller en Economía - @pucp 🇵🇪 | Former RA @wb_research @GRADEPeru | Un gato | RT != respaldo.

[Khoa Vu @KhoaVuUmn]

[Huge scam - mean(huge scam)]/stdev(huge scam)

[Gianluca @gian_fiorini]

Falla logística NO ES fraude.

Es reprochable.
Vale indignarse.
Esperamos explicaciones.

Pero NO ES fraude.

[Philipp Heimberger @heimbergecon]

This is a useful introduction to using Claude code for applied economists, including content on data analysis, web scraping and large datasets.

[Paolo Sosa Villagarcia @paolososa]

Plot twist: Perú ha tenido un solo presidente desde 1990.

[Victor Borda @victor_snail]

Our paper (@OcOutlier ,@MarlaMendesA @ialvim @carolina160195 @cesarsanz3 ,@HeinnerGuio ) on PopGen of Peruvians is finally out in @CommsBio :

https://t.co/WGiHroOYOG

Thank you to the reviewers for their thorough work!

[Cesar Chavez @CesarChavezP29]

I remember the first time I wrote a paper in English, when I was still an undergraduate.
When I decided to send it to a journal, it was rejected because of grammar errors. Not because of the model, not the results. Just grammar errors. I could have perfectly written the paper in Spanish without any grammar mistakes, published it, and it would have had zero impact on my professional life. English proficiency was treated as a proxy for intellectual quality. That is the real problem.

I never took English classes because I could not afford private classes when I was an undergraduate. My high school English classes were so terribly poor that I did not learn anything.

I just learned by doing. By reading papers, by writing papers. And I improved my listening and speaking when I had the opportunity to work in the US, almost eight years ago.

If I had access to an LLM back then, my paper would not have been rejected. The same people who gatekept access through grammar are now gatekeeping through “AI style.” They argue that writing in English “helps you think,” and therefore LLMs should not be used to write anything you do. I disagree. I think an LLM is a tool. Like other tools, it has to be used. It helps me a lot with my grammar mistakes, and with getting feedback with my own ideas.

I think there are scholars who just think with laziness: “Oh, this is AI writing style, this must be slop.” Like a witch hunt, where anyone who uses a tool to overcome a barrier they never had to face is treated as a fraud.

But in the end, they are just focused on the style, not on the content.

Many people around the world have many interesting ideas to be heard. And AI facilitate that.

[Sebastián Ramírez @SebastianRamRa1]

It’s that moment of the year, seeking a part-time job this summer.
PhD student (gender, crime, education) with experience in causal inference, RCTs, and applied micro.
Open to RA work, collaborations, and policy work.

🌐 https://t.co/iMDT9pxnYA

#EconTwitter #RAJobs #PhDLife

[Cesar Chavez @CesarChavezP29]

Mi grano de arena a este debate. Después de las elecciones de 2021, yo también estaba intrigado por los resultados. Cuando ONPE liberó las actas en formato digital (julio 2021), empecé a trabajar en un análisis forense. Terminé la versión final en septiembre 2024, pero para entonces el debate había muerto. Hoy veo que renació.

Aquí está mi paper.
¿Qué encuentro? Usando múltiples técnicas de detección de fraude electoral, ninguna detecta patrones consistentes con manipulación. De hecho, donde los efectos son identificables, van en dirección opuesta a lo que el fraude implicaría: las actas impugnadas están concentradas en territorio fujimorista (Lima: 1.99% de contestación vs. Puno: 0.47%), y esas actas favorecen a Fujimori, no a Castillo.

No hubo fraude.

__________________________________________________
Hoy subi el paper a mi Github.
Link del paper: https://t.co/a178X3XWnp

Todos los codigos estan disponibles para replicacion. Si alguien esta interesado: https://t.co/MeEydcKgvo

[Sebastián Ramírez @SebastianRamRa1]

In one of my classes we had to design a social media project using AI.

Most examples were like content automation, explainers, that kind of thing.

I wanted to try something a bit more useful.

So I started building this:

[Ruijiang Gao @ruijianggao]

What happens when you invite 150 AI economists (Claude Code) to a research conference, give them the exact same data, and ask them to test the same hypotheses?

We did just that. The results reveal a new phenomenon: Nonstandard Errors in AI Agents. 🧵👇

[Joe Kent @joekent16jan19]

After much reflection, I have decided to resign from my position as Director of the National Counterterrorism Center, effective today.

I cannot in good conscience support the ongoing war in Iran. Iran posed no imminent threat to our nation, and it is clear that we started this war due to pressure from Israel and its powerful American lobby.

It has been an honor serving under @POTUS and @DNIGabbard and leading the professionals at NCTC.

May God bless America.

[Mel @Villgecrazylady]

Just so we’re clear… Howard Lutnik is the *architect* of Trump’s tariff plan. He’s the one who pushed Trump on these.

And at the EXACT SAME TIME that he was doing this, Lutnik’s sons **who he appointed to take over his bank** were betting the tariffs would be struck down and buying up refund rights at $0.25 on the dollar.

And now the government owes companies refunds… and depending on how many refund slips they are holding, the Lutnik’s bank could make BILLIONS of dollars.

There’s nothing else I can say about this that won’t catch me a permaban

[NASA Mars @NASAMars]

By studying samples analyzed by the Curiosity rover, scientists have taken another step toward understanding whether life could have ever existed on Mars.

A new study suggests that non-biological sources cannot fully account for the abundance of organic compounds found in a sample collected by the rover.

Dig into the details: https://t.co/zZKCgKEROr

[Kevin Malone @Malone_Wealth]

If you exclude Healthcare jobs, the U.S. Labor Market has declined for 24 months. Everything is not fine.

[Old Media @oldmedia]

Golden Boy (1995)

[Ryan Moulton @moultano]

After all this is over, we need to pass a law that makes social media posts from official agency accounts like this subject to perjury. It is too destructive to the country to let them keep lying and lying and lying without any possible legal remedy.

[Aasma Shaukat MD MPH @AasmaShaukatMD]

One of my former research assistants was killed by ICE in Minneapolis today😢

Alex was the kindest, sweetest human and a ICU nurse with a bright future ahead of him
May his soul rest in peace and this senseless carnage stop💔

[Journal of International Economics @JIntlEcon]

🎓 Call for Applications | JIE Summer School 2026

📍 Milan (Bocconi University) | 🗓 July 6–8, 2026
Lectures by Cécile Gaubert, Christoph Trebesch, David Hémous, Federica Romei, Christopher Clayton & Natalia Ramondo.

🗓 Deadline: Jan 25, 2026

👉 https://t.co/rXcgF6O1DX

[Jinghui (Sage) Yu @SageYJH]

Hi all, I’m excited to share my Job Market Paper
I study how pre-grant patents act as early signals of global innovation diffusion, showing that publication-stage patent shocks drive earlier TFP gains and immediate stock-market responses.
Full Thread below #EconTwitter