@jhelvy.bsky.social
Systems Eng Prof @ GWU 🦛 | Director, Data Analytics MS Program | EVs 🔋🚗 | Low Carbon Tech | Choice Modeling | Survey Research | China | US-China Policy | #rstats | #reproducibility | #opensource | Father | opinions own
If you think that's cool, wait til yoy see my market research tech
Has there ever been a time when the strategy of "if we just keep bombing civilians eventually they'll finally rise up to overthrow their oppressive government" ever worked?
Someone ported Karpathy's microGPT to pure #julialang in 99 lines with 0 dependencies, it's 1600x faster than CPython... hard to emphasize enough how impressive this is
www.reddit.com/r/Julia/s/Vg...
#opensource always wins 😎
There's just as much thinking going on in how I use agents, they just write code for me. I still architect, execute, and test, which is where all the serious thinking lies in coding. Agents just write the tedious bits with fewer human errors (typos).
More likely that we'll need to clarify the opposite, as in "I wrote this code by hand"
@simonwillison.net is the first I've heard use the term "agentic engineering", which feels like a much better description of how I use tools like Claude Code (as opposed to "vibe coding", which implies no human architecting the result). Great stuff in this post:
simonwillison.net/2026/Feb/23/...
Sharing a new #opensource project we've been building: vehicletrends.us — an interactive dashboard tracking U.S. automotive market trends from millions of listings. Data is available via the {vehicletrends} #rstats package. Site made with #Quarto, code at github.com/vehicletrends 🚗 📊
Check out this wide-ranging discussion I had with Frank Sesno, director of the Alliance for a Sustainable Future at GWU. Topics include EV competition, US-based EV production, facing the challenge of Chinese EV leadership, and national security (among other things).
www.youtube.com/watch?v=oUMz...
I wanted a totally static site with no server, would that framework be able to handle that? I never used plumber but heard lots about it.
Yup. For a long time I relied on shiny because it was easy to build, and I just lived with production bottle necks. No more. I think we're going to see an explosion of custom builds using tools and frameworks that we only barely understand but can get working
Note that the main data file, the PMTiles files, is hosted on cloudflare to make it accessible for the actual map, but I also exported the data file as a release on that GitHub repo
Actually I have made the HHI metric I calculated publicly available. It's just the underlying raw data that can't be made available. I'm putting it all into a R package, so look out for that soon.
Yes, JS for sure. The whole file is linked below, and yeah I could never have written it myself. I tinkered with other frameworks like shinylive, but it was just too slow. Once I started over from scratch, plain html was the solution github.com/vehicletrend...
Underlying data is licensed from marketcheck.com, which collects detailed listings data from dealerships across the country. This is part of a larger analysis I've been doing with some data from them. HHI is a measure of market concentration: en.wikipedia.org/wiki/Herfind...
Still works for me, not sure why it isn't for you
That's just plain HTML, which Claude code wrote for me. It's a new age now where all you need is the idea and CC will build the code.
We live in a magical time for #dataviz. This map is just a static html page served on GitHub pages 🤯
It uses the incredible {pmtiles} #rstats package by @kylewalker.bsky.social to quickly filter through ~21M rows of data hosted on Cloudflare
vehicletrends.github.io/hhi-map/
There I fixed it
I teach my students to always start the y-axis at 0 when making a bar chart for a reason
x.com/WhiteHouse/s...
Incredible self own for the US. The damage being done to the US scientific enterprise is generational. We will look back on this as a tipping point where the US chose all on its own to stop leading the world in science.
www.science.org/content/arti...
Now channel your inner Mitch McConnell and stick to it
www.nytimes.com/2026/01/24/u...
Defund ICE or shut the government down. This is the moderate position.
Jim Jones got over 900 people to kill themselves with him. Cults are like that.
People are holding on to hope with "but the Generals wouldn't obey that order right?" and 1) that says a LOT about where we are right now and 2) you better believe they 100% would follow that order, and if not there are hundreds in line who would I mean look at who they put in charge of DoD ffs
For the record, as an American, I think threatening tariffs on our closest European allies and fellow NATO members because they are standing up to US threats to forcibly annex Greenland is bad.
Most Americans have no idea how immensely pissed Canadians are at the US. I'm not Canadian, but have family there, and the damage from the US's betrayal will last a generation or more. There's no returning to the prior relationship regardless who takes power in the US.
