Andrew Holz
@andrewholz.bsky.social
Engineering manager type -- privileged to get to work with the Shiny, Quarto, mlverse and Tiny (py) Tools teams at Posit towards code first data science nirvana!
Reposted by Andrew Holz
Introducing bluffbench, a new tool to evaluate how well LLMs actually see data plots.
When we trick LLMs with secret #RStats transformations, they can miss the visual contradiction.
bluffbench helps us measure this "blind spot" in AI coding agents. Learn more: posit.co/blog/introdu...
When we trick LLMs with secret #RStats transformations, they can miss the visual contradiction.
bluffbench helps us measure this "blind spot" in AI coding agents. Learn more: posit.co/blog/introdu...
When plotting, LLMs see what they expect to see - Posit
Data science agents need to accurately read plots even when the content contradicts their expectations. Our testing shows today's LLMs still struggle here.
posit.co
November 19, 2025 at 4:55 PM
Introducing bluffbench, a new tool to evaluate how well LLMs actually see data plots.
When we trick LLMs with secret #RStats transformations, they can miss the visual contradiction.
bluffbench helps us measure this "blind spot" in AI coding agents. Learn more: posit.co/blog/introdu...
When we trick LLMs with secret #RStats transformations, they can miss the visual contradiction.
bluffbench helps us measure this "blind spot" in AI coding agents. Learn more: posit.co/blog/introdu...
I am looking forward to PyData Boston in a few weeks. If anyone is going and wants to meet up please let me know. I will be sitting at the Posit table quite a bit of the time. I went to the last few PyData NYCs so it will be interesting to see how it differs. pydata.org/boston2025
PyData Boston 2025
pydata.org
November 20, 2025 at 2:12 PM
I am looking forward to PyData Boston in a few weeks. If anyone is going and wants to meet up please let me know. I will be sitting at the Posit table quite a bit of the time. I went to the last few PyData NYCs so it will be interesting to see how it differs. pydata.org/boston2025
Reposted by Andrew Holz
We're hiring an open-source #python developer focused on modeling APIs!
tidyverse.org/blog/2025/11...
#numpy #scipy #scikitlearn
tidyverse.org/blog/2025/11...
#numpy #scipy #scikitlearn
Python Open-Source Developer
Posit is hiring a Python open-source developer to create more data analysis tools.
tidyverse.org
November 12, 2025 at 5:46 PM
We're hiring an open-source #python developer focused on modeling APIs!
tidyverse.org/blog/2025/11...
#numpy #scipy #scikitlearn
tidyverse.org/blog/2025/11...
#numpy #scipy #scikitlearn
How long before I can get a credit card with a reward program paying out in Anthropic or OpenAI token credits?
October 23, 2025 at 4:46 PM
How long before I can get a credit card with a reward program paying out in Anthropic or OpenAI token credits?
In case you missed it in all the posit::conf 2025 content, checking out part 3 of Veerle van Leemput's series on building your first AI powered app is worth checking out! shiny.posit.co/blog/posts/s...
Shiny - Build Your First LLM App with Shiny for Python or R
Shiny is a package that makes it easy to create interactive web apps using R and Python.
shiny.posit.co
September 23, 2025 at 1:57 PM
In case you missed it in all the posit::conf 2025 content, checking out part 3 of Veerle van Leemput's series on building your first AI powered app is worth checking out! shiny.posit.co/blog/posts/s...
Part two of Veerle van Leemput's exploration of LLMs is out. Her exposition is so clear and easy to follow even if you are not likely to use Shiny its worth checking out! shiny.posit.co/blog/posts/s...
Shiny - Talking to LLMs: From Prompt to Response
Shiny is a package that makes it easy to create interactive web apps using R and Python.
shiny.posit.co
September 8, 2025 at 7:02 PM
Part two of Veerle van Leemput's exploration of LLMs is out. Her exposition is so clear and easy to follow even if you are not likely to use Shiny its worth checking out! shiny.posit.co/blog/posts/s...
Reposted by Andrew Holz
Introducing Databot: an AI assistant for exploratory data analysis in #Python and #RStats!
A research preview in Positron, Databot is a tireless pair programmer to help you explore data.
Learn more about this tool and our philosophy behind it:
🤖 posit.co/blog/introdu...
⚠️ posit.co/blog/databot...
A research preview in Positron, Databot is a tireless pair programmer to help you explore data.
Learn more about this tool and our philosophy behind it:
🤖 posit.co/blog/introdu...
⚠️ posit.co/blog/databot...
August 29, 2025 at 2:03 PM
Introducing Databot: an AI assistant for exploratory data analysis in #Python and #RStats!
A research preview in Positron, Databot is a tireless pair programmer to help you explore data.
Learn more about this tool and our philosophy behind it:
🤖 posit.co/blog/introdu...
⚠️ posit.co/blog/databot...
A research preview in Positron, Databot is a tireless pair programmer to help you explore data.
Learn more about this tool and our philosophy behind it:
🤖 posit.co/blog/introdu...
⚠️ posit.co/blog/databot...
Finally got Glimpse out focused on what the Posit open source team has been up to. Turns out its quite a bit! posit.co/blog/posit-g...
I continue to be happy with the approach we (Posit) are taking with LLMs and AI. Too impactful to ignore but focus on useful and safe as much as possible.
I continue to be happy with the approach we (Posit) are taking with LLMs and AI. Too impactful to ignore but focus on useful and safe as much as possible.
Posit
Posit's latest glimpse newsletter highlights new product releases, including the Positron IDE and several new LLM-powered tools.
posit.co
August 27, 2025 at 5:57 PM
Finally got Glimpse out focused on what the Posit open source team has been up to. Turns out its quite a bit! posit.co/blog/posit-g...
I continue to be happy with the approach we (Posit) are taking with LLMs and AI. Too impactful to ignore but focus on useful and safe as much as possible.
I continue to be happy with the approach we (Posit) are taking with LLMs and AI. Too impactful to ignore but focus on useful and safe as much as possible.
You might be in a certain kind of family if... as leftovers are being put away in the fridge there is an involved discussion on if the fridge is LIFO or FIFO and if that is family member specific. Then the undeniable trump card is played and its really MDFO (Most Delicious) for everyone.
August 22, 2025 at 12:10 AM
You might be in a certain kind of family if... as leftovers are being put away in the fridge there is an involved discussion on if the fridge is LIFO or FIFO and if that is family member specific. Then the undeniable trump card is played and its really MDFO (Most Delicious) for everyone.
This is fantastic! Really looking forward to using this … like tomorrow! Let’s gooooo!
Excited to share my newest quarto revealjs plugin: imagemover
Easily reposition and resize images directly in your quarto revealjs slides for a much smoother slidecrafting experience
github.com/EmilHvitfeld...
#quarto
Easily reposition and resize images directly in your quarto revealjs slides for a much smoother slidecrafting experience
github.com/EmilHvitfeld...
#quarto
August 15, 2025 at 1:03 AM
This is fantastic! Really looking forward to using this … like tomorrow! Let’s gooooo!
Reposted by Andrew Holz
Announcing a new blog series on LLMs from @veerle.hypebright.nl!
Part 1: "What LLMs Actually Do (and What They Don't)" breaks down complex concepts like transformers, hallucinations, and RAG in simple terms.
Check it out here: shiny.posit.co/blog/posts/s...
#RStats #LLM #PythonProgramming
Part 1: "What LLMs Actually Do (and What They Don't)" breaks down complex concepts like transformers, hallucinations, and RAG in simple terms.
Check it out here: shiny.posit.co/blog/posts/s...
#RStats #LLM #PythonProgramming
Shiny - What LLMs Actually Do (and What They Don’t)
Shiny is a package that makes it easy to create interactive web apps using R and Python.
shiny.posit.co
August 6, 2025 at 5:03 PM
Announcing a new blog series on LLMs from @veerle.hypebright.nl!
Part 1: "What LLMs Actually Do (and What They Don't)" breaks down complex concepts like transformers, hallucinations, and RAG in simple terms.
Check it out here: shiny.posit.co/blog/posts/s...
#RStats #LLM #PythonProgramming
Part 1: "What LLMs Actually Do (and What They Don't)" breaks down complex concepts like transformers, hallucinations, and RAG in simple terms.
Check it out here: shiny.posit.co/blog/posts/s...
#RStats #LLM #PythonProgramming
Testing work or apps that leverage LLMs is disturbingly difficult. At Posit we have been exploring how to do this as we explore RESPONSIBLE usage of LLMs in data science. Sara and Simon share some findings about which models play nice with Pandas. 🐼
posit.co/blog/python-...
posit.co/blog/python-...
Posit
This blog post evaluates various large language models (LLMs) for their Python code generation capabilities, focusing on Pandas-related problems from the DS-1000 dataset.
posit.co
July 28, 2025 at 4:10 PM
Testing work or apps that leverage LLMs is disturbingly difficult. At Posit we have been exploring how to do this as we explore RESPONSIBLE usage of LLMs in data science. Sara and Simon share some findings about which models play nice with Pandas. 🐼
posit.co/blog/python-...
posit.co/blog/python-...
Reposted by Andrew Holz
Ever wonder about the mind behind Pandas & Apache Arrow? 🤔 Ep. 2 of #TheTestSet (Part 1!) unpacks @wesmckinney.com's journey, including his speedrunning past! What makes good tools good?
🎧 Listen at thetestset.co, on Spotify, or Apple Podcasts
#Python #DataEngineering #OpenSource #PodcastLaunch
🎧 Listen at thetestset.co, on Spotify, or Apple Podcasts
#Python #DataEngineering #OpenSource #PodcastLaunch
July 15, 2025 at 2:48 PM
Ever wonder about the mind behind Pandas & Apache Arrow? 🤔 Ep. 2 of #TheTestSet (Part 1!) unpacks @wesmckinney.com's journey, including his speedrunning past! What makes good tools good?
🎧 Listen at thetestset.co, on Spotify, or Apple Podcasts
#Python #DataEngineering #OpenSource #PodcastLaunch
🎧 Listen at thetestset.co, on Spotify, or Apple Podcasts
#Python #DataEngineering #OpenSource #PodcastLaunch
Let’s be clear. LLMs do not hallucinate.
LLMs are not trying to be correct, they are trying to be plausible.
LLMs are not trying to be correct, they are trying to be plausible.
July 9, 2025 at 9:08 PM
Let’s be clear. LLMs do not hallucinate.
LLMs are not trying to be correct, they are trying to be plausible.
LLMs are not trying to be correct, they are trying to be plausible.
Love seeing the communities work on Posit's blog. If you have an awesome Quarto or Shiny blogpost you think you are missing ping me and lets see if we can work it out! posit.co/blog/race-st...
Posit
Drew Coughlin demonstrates how the querychat package can create an LLM-powered dashboard that allows natural language queries of trail race data.
posit.co
June 17, 2025 at 8:44 PM
Love seeing the communities work on Posit's blog. If you have an awesome Quarto or Shiny blogpost you think you are missing ping me and lets see if we can work it out! posit.co/blog/race-st...
Reposted by Andrew Holz
Quarto Iconify 3.0.0 is there!
Set your own global default values via the YAML frontmatter because sometimes you want things to get upside down all at once 🙃
github.com/mcanouil/qua...
#Quarto #Iconify #HTML
Set your own global default values via the YAML frontmatter because sometimes you want things to get upside down all at once 🙃
github.com/mcanouil/qua...
#Quarto #Iconify #HTML
May 20, 2025 at 4:20 PM
Quarto Iconify 3.0.0 is there!
Set your own global default values via the YAML frontmatter because sometimes you want things to get upside down all at once 🙃
github.com/mcanouil/qua...
#Quarto #Iconify #HTML
Set your own global default values via the YAML frontmatter because sometimes you want things to get upside down all at once 🙃
github.com/mcanouil/qua...
#Quarto #Iconify #HTML
So happy to work at a company that shows up for open source! Lets go!!!
Yesterday, @opensourcepledge.com was on Nasdaq Tower in Times Square. I got to be there for it! Thank you to Nasdaq and congratulations to all of the featured companies who #paythemaintainers! 👏 What a great way to keep celebrating #maintainermonth! 💃
May 7, 2025 at 6:01 PM
So happy to work at a company that shows up for open source! Lets go!!!
Love it, or hate it LLMs are going to have a profound impact on software development and data science. At Posit I have been helping the team grapple with the tech. I wrote up our process and experiences with it. Would love to hear about other orgs have engaged with them. posit.co/blog/llm-hac...
Posit
Posit's internal AI/LLM hackathons are providing valuable firsthand experience for employees exploring the technology. After several months, here are some key lessons learned.
posit.co
May 1, 2025 at 1:35 PM
Love it, or hate it LLMs are going to have a profound impact on software development and data science. At Posit I have been helping the team grapple with the tech. I wrote up our process and experiences with it. Would love to hear about other orgs have engaged with them. posit.co/blog/llm-hac...
Posit has been up to lots of exciting stuff. I wrote a short overview of it as a Glimpse Newsletter. Lots of LLM/AI (its important whether you love it or hate it)... Beyond product announcements, there are also some great learning resources. Let me know what you think. posit.co/blog/posit-g...
Posit
Read about new LLM tools for R and Python, improved interoperability, community events, learning resources, and more.
posit.co
April 16, 2025 at 5:40 PM
Posit has been up to lots of exciting stuff. I wrote a short overview of it as a Glimpse Newsletter. Lots of LLM/AI (its important whether you love it or hate it)... Beyond product announcements, there are also some great learning resources. Let me know what you think. posit.co/blog/posit-g...
Simon has been killing it, building packages and exploring the use of AI/LLMs in R. It seems like deciding on which base model to use should be straightforward forward, but even that takes thoughtfulness, a systematic approach and is a (fast) moving target!
New on my blog: OpenAI dropped a trio of models yesterday that they claim result from "focusing closely on real-world developer needs." I was curious whether this might mean stronger #rstats coding performance.
www.simonpcouch.com/blog/2025-04...
www.simonpcouch.com/blog/2025-04...
April 15, 2025 at 3:59 PM
Simon has been killing it, building packages and exploring the use of AI/LLMs in R. It seems like deciding on which base model to use should be straightforward forward, but even that takes thoughtfulness, a systematic approach and is a (fast) moving target!
Reposted by Andrew Holz
New on my blog: OpenAI dropped a trio of models yesterday that they claim result from "focusing closely on real-world developer needs." I was curious whether this might mean stronger #rstats coding performance.
www.simonpcouch.com/blog/2025-04...
www.simonpcouch.com/blog/2025-04...
April 15, 2025 at 3:49 PM
New on my blog: OpenAI dropped a trio of models yesterday that they claim result from "focusing closely on real-world developer needs." I was curious whether this might mean stronger #rstats coding performance.
www.simonpcouch.com/blog/2025-04...
www.simonpcouch.com/blog/2025-04...
Reposted by Andrew Holz
We are delighted to announce the release of ellmer, an R package for accessing the power of LLMs in R!
ellmer supports a variety of model providers. Chat, tool call, stream API calls, extract structured data, and more!
Learn about it here: posit.co/blog/announc...
#RStats #AI #LLM
ellmer supports a variety of model providers. Chat, tool call, stream API calls, extract structured data, and more!
Learn about it here: posit.co/blog/announc...
#RStats #AI #LLM
February 26, 2025 at 3:01 PM
We are delighted to announce the release of ellmer, an R package for accessing the power of LLMs in R!
ellmer supports a variety of model providers. Chat, tool call, stream API calls, extract structured data, and more!
Learn about it here: posit.co/blog/announc...
#RStats #AI #LLM
ellmer supports a variety of model providers. Chat, tool call, stream API calls, extract structured data, and more!
Learn about it here: posit.co/blog/announc...
#RStats #AI #LLM
Reposted by Andrew Holz
Meet gander, a chat interface for R data scientists🪿
gander automatically incorporates context from your #rstats environment and surrounding code and can be used with any model supported by ellmer in either RStudio or Positron.
Read more: simonpcouch.github.io/gander/
gander automatically incorporates context from your #rstats environment and surrounding code and can be used with any model supported by ellmer in either RStudio or Positron.
Read more: simonpcouch.github.io/gander/
January 16, 2025 at 2:47 PM
Meet gander, a chat interface for R data scientists🪿
gander automatically incorporates context from your #rstats environment and surrounding code and can be used with any model supported by ellmer in either RStudio or Positron.
Read more: simonpcouch.github.io/gander/
gander automatically incorporates context from your #rstats environment and surrounding code and can be used with any model supported by ellmer in either RStudio or Positron.
Read more: simonpcouch.github.io/gander/
Messing with CSS and doing it project by project, and format by format, across bigger organizations has been a nightmare. I have been a huge flag carrier at Posit for brand.yml to work help solve it. Sara walks us through the first steps on the road.
posit.co/blog/unified...
posit.co/blog/unified...
Unified branding across Posit tools with brand.yml - Posit
Introducing brand.yml: define your organization’s branding in a single YAML file and apply that branding across reports, dashboards, and apps.
posit.co
January 8, 2025 at 4:00 PM
Messing with CSS and doing it project by project, and format by format, across bigger organizations has been a nightmare. I have been a huge flag carrier at Posit for brand.yml to work help solve it. Sara walks us through the first steps on the road.
posit.co/blog/unified...
posit.co/blog/unified...
So excited we are joining this effort at Posit!
@opensourcepledge.com members just reached almost $2.5 million paid to maintainers over the past year thanks to @posit.co joining 💚
January 7, 2025 at 4:32 PM
So excited we are joining this effort at Posit!