Here we are 👉🗺️ the final day of #30DayMapChallenge 2025 💛
30 maps, 30 ideas — exploring data, design, projections, rasters, OSM layers, insets, palettes & reproducible R workflows.
Improved something new every day. 💛
#RStats #GIS #DataViz #Geospatial #Quarto
🎥 The recording of “Machine Learning in Epidemiology with R — Part 2” is now available!
Join R-Ladies Rome to explore heart disease classification with random forests, neural networks, and model evaluation in R.
youtube.com/watch?v=Zi4eCdxL…
#RLadies #RStats
🌳 From trees to neural networks!
Join @RLadiesRome for Part II of Machine Learning in Epidemiology with R, led by Federica Gazzelloni.
📅 23 October · Online · 2 hours
💻 Compare models with mlr3 and Keras.
Register: luma.com/vh9boae8
#RStats #RLadies
Why a high benchmark score doesn't mean what you think:
1️⃣ Scores are relationships, not innate traits.
2️⃣ Goodhart’s Law is real—tests reshape what they measure.
3️⃣ Performance ≠ Learning or generalizability.
Continue Reading: federicagazzelloni.substack.…
🎥 The recording of our @RLadiesRome workshop, “Introduction to Machine Learning in Epidemiology with R,” is now available!
Watch: youtube.com/watch?v=v8bx-BYv…
Code: github.com/fgazzelloni/Intro…
#RStats #MachineLearning #Epidemiology
New issue: Notes on Data and Learning — N.29
When a model shapes a decision, the outcome becomes part of the next dataset. The analytical workflow is no longer a straight line, but a feedback loop.
Read on Substack: federicagazzelloni.substack.…
#DataScience #AI #ActuarialScience
New issue out! 📊
Notes on Data and Learning — N.28: Before the Pipeline, There Is a Question
AI can retrieve data, write code, transform datasets, build models, and explain results.
Read more federicagazzelloni.substack.…
#DataScience #AI #DataAnalytics #RStats
📢 New R-Ladies Rome workshop!
Introduction to Machine Learning in Epidemiology with R
RSVP: luma.com/xmchetzk
A practical session.
No previous ML experience required. Everyone is welcome! 💜
#RLadies #RLadiesRome #RStats #MachineLearning #Epidemiology
From reproducibility to auditability in AI-augmented analytics
When AI enters an analytical workflow, preserving data and code is no longer enough. We also need to reconstruct context.
Continue reading: federicagazzelloni.substack.…
#DataScience #AI #ReproducibleResearch #AIGovernance
The latest issue of Notes on Data and Learning is out: When Data Becomes Conversational.
Read the full issue: federicagazzelloni.substack.…
#DataScience #AI #ReproducibleResearch
📢 Next up at R-Ladies Rome!
Typst for Efficient Typesetting with Derek Sollberger (@Princeton)
Discover how Typst + Quarto, publication-quality PDFs—without the complexity of LaTeX.
📅 Registration: luma.com/k9bw4g7e
#RLadiesRome #RStats #Typst #Quarto #Reproducible
📚 New issue out!
Notes on Data and Learning — N.25
This week I reflect on something I hadn’t fully appreciated before: the real cost of modern technical work is often not multitasking, but rebuilding context.
👇 Read the full issue: federicagazzelloni.substack.…
📚 New issue — Notes on Data and Learning N.24
Learning R isn't just memorizing functions. With AI automating code, the crucial skill is understanding workflows — how data, code, docs, and decisions connect.
Read: federicagazzelloni.substack.…
#RStats #DataScience #AI
New issue out ✍️
Notes on Data and Learning — N.23
When Priorities Choose Themselves
This week was supposed to be about organization.
Continue Reading: federicagazzelloni.substack.…
📢 Upcoming R-Ladies Rome Workshop
From Data Analysis to Publication: Reproducible Research with R and Quarto
🎙️ With Betsabé Cohen & Jesica Formoso (R-Ladies+ Buenos Aires)
📅 Registration: luma.com/j2qxv1pr
#RLadiesRome #RStats #QuartoPub #ReproducibleResearch
In this week’s issue, I reflect on memory, judgment, programming education,.
Read the full issue : federicagazzelloni.substack.…
#RStats #DataScience #ArtificialIntelligence #Programming #Education #Teaching #Learning #ComputationalThinking #Statistics #NotesOnDataAndLearning #AI
New issue published.
Notes on Data and Learning — N.20
Learning Structure: Notes, Graphs, and the Coordination of Uncertainty
This week I wrote about Obsidian and Ebola. How much structure is enough to preserve reasoning without creating noise?
Read More: federicagazzelloni.substack.…
Federica Gazzelloni® (she/her) retweeted
LLM Knowledge Bases
Something I'm finding very useful recently: using LLMs to build personal knowledge bases for various topics of research interest. In this way, a large fraction of my recent token throughput is going less into manipulating code, and more into manipulating knowledge (stored as markdown and images). The latest LLMs are quite good at it. So:
Data ingest:
I index source documents (articles, papers, repos, datasets, images, etc.) into a raw/ directory, then I use an LLM to incrementally "compile" a wiki, which is just a collection of .md files in a directory structure. The wiki includes summaries of all the data in raw/, backlinks, and then it categorizes data into concepts, writes articles for them, and links them all. To convert web articles into .md files I like to use the Obsidian Web Clipper extension, and then I also use a hotkey to download all the related images to local so that my LLM can easily reference them.
IDE:
I use Obsidian as the IDE "frontend" where I can view the raw data, the the compiled wiki, and the derived visualizations. Important to note that the LLM writes and maintains all of the data of the wiki, I rarely touch it directly. I've played with a few Obsidian plugins to render and view data in other ways (e.g. Marp for slides).
Q&A:
Where things get interesting is that once your wiki is big enough (e.g. mine on some recent research is ~100 articles and ~400K words), you can ask your LLM agent all kinds of complex questions against the wiki, and it will go off, research the answers, etc. I thought I had to reach for fancy RAG, but the LLM has been pretty good about auto-maintaining index files and brief summaries of all the documents and it reads all the important related data fairly easily at this ~small scale.
Output:
Instead of getting answers in text/terminal, I like to have it render markdown files for me, or slide shows (Marp format), or matplotlib images, all of which I then view again in Obsidian. You can imagine many other visual output formats depending on the query. Often, I end up "filing" the outputs back into the wiki to enhance it for further queries. So my own explorations and queries always "add up" in the knowledge base.
Linting:
I've run some LLM "health checks" over the wiki to e.g. find inconsistent data, impute missing data (with web searchers), find interesting connections for new article candidates, etc., to incrementally clean up the wiki and enhance its overall data integrity. The LLMs are quite good at suggesting further questions to ask and look into.
Extra tools:
I find myself developing additional tools to process the data, e.g. I vibe coded a small and naive search engine over the wiki, which I both use directly (in a web ui), but more often I want to hand it off to an LLM via CLI as a tool for larger queries.
Further explorations:
As the repo grows, the natural desire is to also think about synthetic data generation + finetuning to have your LLM "know" the data in its weights instead of just context windows.
TLDR: raw data from a given number of sources is collected, then compiled by an LLM into a .md wiki, then operated on by various CLIs by the LLM to do Q&A and to incrementally enhance the wiki, and all of it viewable in Obsidian. You rarely ever write or edit the wiki manually, it's the domain of the LLM. I think there is room here for an incredible new product instead of a hacky collection of scripts.
New issue of Notes on Data and Learning published:
N.19 — The Geometry of Coordination
This week’s reflection started from an unexpected place: the strange way ideas continue moving after a project is technically “finished.”
Continue Reading federicagazzelloni.substack.…
🦠 Questa Domenica terrò un incontro online in italiano su Hantavirus, epidemiologia e diffusione delle infezioni negli ambienti chiusi e connessi.
🎁 Giveaway di 1–2 copie del mio libro.
🔗 luma.com/rhx85w27
📅 Domenica
🕡 17:00
💻 Online
#Hantavirus #SalutePubblica
New R-Hack published: Your Script Is Not a Workflow
The problem often appears only later, when the session is restarted and the analysis depends on objects, steps, or assumptions that were never made explicit.
👉 Read the full issue here: romerusersgroup.github.io/co…




















