's Avatar

@ulrichatz

Professor (Asst) at Bocconi U - NYU Stern Center for Sustainable Business - data and sustainability

35
Followers
113
Following
62
Posts
04.12.2024
Joined
Posts Following

Latest posts by @ulrichatz

Preview
GitHub - posit-dev/skills: A collection of Claude Skills from Posit A collection of Claude Skills from Posit. Contribute to posit-dev/skills development by creating an account on GitHub.

You add the posit marketplace, install r-lib, and invoke the skill at an opportune moment (or claude code runs it for you with the right trigger words).

The README has some instructions.

github.com/posit-dev/sk...

02.03.2026 21:29 πŸ‘ 2 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

I should add the "Kratt momentum" page is from 2018.

02.03.2026 10:24 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

and

"An interesting aspect of the kratt is that it was necessary for it to constantly keep working, otherwise it would turn dangerous to its owner."

02.03.2026 10:15 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Preview
Kratt - Wikipedia

Estonians were truly ahead of the #AI curve: "in Estonia [the Kratt, a golemesque creature] is used as a metaphor for AI and its complexities. For instance, algorithmic-liability law is also called the Kratt law."

en.wikipedia.org/wiki/Kratt

02.03.2026 10:15 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Preview
skills/r-lib/cran-extrachecks at main Β· posit-dev/skills A collection of Claude Skills from Posit. Contribute to posit-dev/skills development by creating an account on GitHub.

use this skill for some extra help on the arcane: github.com/posit-dev/sk...

01.03.2026 20:44 πŸ‘ 5 πŸ” 2 πŸ’¬ 1 πŸ“Œ 0
Bullshit Benchmark tests whether models challenge nonsensical prompts instead of confidently answering them.

Bullshit Benchmark tests whether models challenge nonsensical prompts instead of confidently answering them.

The #AI benchmark that matters

github.com/petergpt/bul...

25.02.2026 22:29 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Evergreen: bsky.app/profile/ulri...

22.02.2026 09:34 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Video thumbnail

Vibecoding in #Rstats visualized

18.02.2026 16:45 πŸ‘ 11 πŸ” 3 πŸ’¬ 1 πŸ“Œ 0
Zalgo-style glitch text: \glitch{UNFINISHED}

Zalgo-style glitch text: \glitch{UNFINISHED}

New \glitch{} #latex command just dropped to freak out your coauthors. Tells exactly how the paper is going.

gist.github.com/statzhero/ea...

11.02.2026 23:08 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Preview
`dplyr::if_else()` and `dplyr::case_when()` are up to 30x faster dplyr 1.2.0 comes with much faster and more memory efficient `if_else()` and `case_when()` functions!

Last week we released dplyr 1.2.0, but we left off something VERY important πŸ™‚

`dplyr::if_else()` and `dplyr::case_when()` are now up to 30x faster and use 10x less memory!

We dive into how we achieved these numbers in this new #rstats post!

tidyverse.org/blog/2026/02...

10.02.2026 13:03 πŸ‘ 127 πŸ” 21 πŸ’¬ 4 πŸ“Œ 1
Github error 500

Github error 500

is github down?

09.02.2026 16:15 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Video thumbnail

Child at the podium: β€œA woo woo woo.”

Mamdani: That’s how I felt when we came up with this plan. Together, we will expand the idea of what is possible in our cityβ€”and what sounds and noises we can make at a press conference.

06.02.2026 04:11 πŸ‘ 42866 πŸ” 7411 πŸ’¬ 1063 πŸ“Œ 1882

It's also titled: "Olympic ski jumpers to be investigated for β€˜injecting penises with acid’"

06.02.2026 02:52 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Tagging you here as we were talking about the news: @paulgp.com

06.02.2026 02:31 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Testing Claude Opus 4.6: Finance Skill – ulrich atz Can an LLM Capitalize R&D Expenses?

The usual #AI pros and cons apply also for Claude Finance (as of today): it is remarkably fast and capable, but still requires supervision and will make mistakes. The spreadsheets look spiffy though.

statzhero.github.io/ulrichatz/blog/opus-finance.html

06.02.2026 02:30 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Testing Claude Opus 4.6: Finance Skill – ulrich atz Can an LLM Capitalize R&D Expenses?

Today, Anthropic released Claude Opus 4.6 with a #Finance plugin. I tested it on capitalizing VW's R&D expenses. In one vague prompt I got a full spreadsheet with amortization schedules and ROIC calculations.

06.02.2026 02:30 πŸ‘ 6 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0

Happening right now, I could live post it.

It's also confusing to me what agents are doing at any moment. Not unlike a classroom.

06.02.2026 01:46 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Actually, the one thing I will try it for is TikZ graphics because Claude needs an agent team member with β€œeyes”.

06.02.2026 01:17 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

I saw this and was like: I am become RA manager, destroyer of tokens.

but I’m happy with my subagents for now.

06.02.2026 01:12 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

What’s the use case?

06.02.2026 01:05 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Is there an #rstats equivalent?

03.02.2026 15:06 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

A correct take

31.01.2026 15:54 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

`seed(42)` is the new em dash.

30.01.2026 10:40 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 1

One more q: will it work without the Letta max plan? πŸ’€

29.01.2026 18:04 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Prompt injection I guess would be top of mind. Or it overwrites the permission settings.

29.01.2026 17:55 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Zotero Blog Β» Blog Archive Β» Zotero 8 Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.

One of the greatest tools for scientific production relaunched: #Zotero 8.

www.zotero.org/blog/zotero-8/

29.01.2026 15:56 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Looks awesome. Can you provide a high-level comment on its security, ie if it is beyond the usual dangers of using Claude Code?

29.01.2026 10:29 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
πŸ§ͺ Validation

RMCP has been tested with real-world scenarios achieving 100% success rate:

    βœ… Business Analysts: Sales forecasting with 97.9% RΒ², $4.70 ROI per marketing dollar
    βœ… Economists: Macroeconomic analysis confirming Okun's Law (r=-0.944)
    βœ… Data Scientists: Customer churn prediction with 100% accuracy
    βœ… Researchers: Treatment effect analysis with significant results (p<0.001)

πŸ§ͺ Validation RMCP has been tested with real-world scenarios achieving 100% success rate: βœ… Business Analysts: Sales forecasting with 97.9% RΒ², $4.70 ROI per marketing dollar βœ… Economists: Macroeconomic analysis confirming Okun's Law (r=-0.944) βœ… Data Scientists: Customer churn prediction with 100% accuracy βœ… Researchers: Treatment effect analysis with significant results (p<0.001)

Sure, buddy.

#rstats #mcp

21.01.2026 13:58 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

The design aims to follow the approach in Ian Gow and Tony Ding's "Empirical Research in Accounting: Tools and Methods" book, which emphasizes reproducible workflows.

21.01.2026 10:24 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

It provides:
- Secure credential management via your system keyring
- Pre-built functions for Compustat, CCM, and linking tables
- Standard default research filters, and an argument to fill in missing SIC fields

21.01.2026 10:24 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0