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Eric Pedersen

@ericjpedersen.bsky.social
2.3K followers 829 following 285 posts

Associate prof of biology prof at Concordia University. Lost in the wilds between ecology, statistics, and dynamic systems. Always interested in chatting all things GAM- and nonlinear-system related.

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Reposted by Eric Pedersen
David Ho @davidho.bsky.social · 03/10/2026
The internet is so weird sometimes.
A horizontal four-panel meme digital graphic featuring a paleontology joke about whale evolution. In the top-left panel, a brown, four-legged Pakicetus walks toward the right on land, saying, "Indohyus, my brother. I've decided to search for more food in the waters." In the top-right panel, a green-yellow canine-like Indohyus stands facing left, responding, "You will regret this, Pakicetus. The enviornment will force you to adapt," while the head of Pakicetus replies, "I just need some shrimps lol / I will be perfectly fine." The second row features a large black header box on the left reading "50 million years later..." in bold italicized white text, while the rest of the light blue panel depicts the massive side profile of a blue whale making loud vocalizations rendered as text above it ("AAAAOOOOOOOOOOO / OAAAAAAH / MRUUUUUUUUH") alongside a tiny white-tailed deer head looking at it in shock. The bottom panel shows a close-up of the blue whale's head and baleen plates bellowing "BWOOOOOOOOOOEEEEEE" on the left, directly opposite a larger image of a white-tailed deer staring wide-eyed at the viewer on the right with the text "WTF" written above its head.
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Eric Pedersen @ericjpedersen.bsky.social · 15/09/2026
Canadian negotiators will be pushing hard for a moratorium on Europeans calling anything "poutine" until they have been properly trained in how to make a proper cheese curd
Banner hanging in Leipzig train station advertising "Kabadische Poutine" for 7.20€, with a picture of fries covered in what looks like salsa and salad dressing
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Reposted by Eric Pedersen
Vincent Arel-Bundock @vincentab.bsky.social · 04/09/2026
Big news! 🎉 𝚖𝚊𝚛𝚐𝚒𝚗𝚊𝚕𝚎𝚏𝚏𝚎𝚌𝚝𝚜 1.0.0 for #Rstats is out. It’s a big number and it feels like a big step. I wrote a blog on the challenges of interpreting statistical models, SPEED, cool new features, the future, and a 5 year package development and writing odyssey. arelbundock.com/posts/margin...
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Eric Pedersen @ericjpedersen.bsky.social · 03/09/2026
Stylized picture of a lion turtle from Legend of Korra. Back covered in for forest
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Carolyn 🇨🇦 @carolynp.bsky.social · 24/08/2026
Meme from Lord of the Rings. Gimli: never thought I’d die fighting side by side with Doug Ford. Legolas: I’m gonna rip out all the bike lanes. Gimli: Christ alive you’re the worst.
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Eric Pedersen @ericjpedersen.bsky.social · 23/08/2026
"Hark a Vagrant" might be the best possible introduction to Canadian humour
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Eric Pedersen @ericjpedersen.bsky.social · 23/08/2026
:) this made my night (the joke, not the website)
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Eric Pedersen @ericjpedersen.bsky.social · 23/08/2026
We have all of Murder She Wrote on DVD here :). Although be warned: Farthing is maybe better described as an uncosy mystery... It's framed like one and starts out like a typical take on Agatha Christie, but you definitely won't finish the book feeling cosy about the world after reading it
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Eric Pedersen @ericjpedersen.bsky.social · 23/08/2026
Like cosy murder mysteries? Like alt history? Like dark examinations of how the path to fascism is easily hidden beneath middle class gentile politeness? Read Farthing by @bluejo.eurosky.social www.jowaltonbooks.com/books/the-sm...
jowaltonbooks.com
Farthing | Jo Walton -- Science Fiction and Fantasy Author
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Eric Pedersen @ericjpedersen.bsky.social · 23/08/2026
Everyone should read Ducks at least once in their life. And also everything else by @katebeaton.bsky.social www.goodreads.com/book/show/59...
goodreads.com
Ducks: Two Years in the Oil Sands
Celebrated cartoonist Kate Beaton vividly presents the …
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Reposted by Eric Pedersen
Michael Samonek @samonek.bsky.social · 22/08/2026
A huge part of my interest in "indie" Animation comes from being exposed to weird-ass projects funded by the National Film Board.
The Big Snit (1985)
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Eric Pedersen @ericjpedersen.bsky.social · 23/08/2026
I hold a grudge against downtown Ottawa after trying to find a single restaurant open for dinner at 6 pm
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Eric Pedersen @ericjpedersen.bsky.social · 23/08/2026
Ottawa at night
static.klipy.com
Steppenläufer Tumbleweed
Alt: GIF of a desert landscape with a tumbleweed drifting by
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Eric Pedersen @ericjpedersen.bsky.social · 23/08/2026
That's so ominous...
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Eric Pedersen @ericjpedersen.bsky.social · 23/08/2026
Broken Social Scene: pretty much everything they have ever done youtu.be/wLaDksDOcE4?... youtu.be/qeMOtslWIws?...
youtu.be
Broken Social Scene - Anthems For A Seventeen Year Old Girl (Official Video)
YouTube video by Broken Social Scene
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Eric Pedersen @ericjpedersen.bsky.social · 23/08/2026
"One Great City": Best love song for a city from a punk rocker who became a folk poet. I fall in love again with the lyrics all over again every time I hear it youtu.be/YdxzNy-apdY?...
youtu.be
One Great City!
YouTube video by The Weakerthans - Topic
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Eric Pedersen @ericjpedersen.bsky.social · 23/08/2026
I can see why you'd think that living in Ottawa. We need to get you to Montreal 😁
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Reposted by Eric Pedersen
Kent Lind @camasonian.bsky.social · 17/08/2026
We have data on this. The blue is all the non-ag human use:
Colorado River usage chart
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Eric Pedersen @ericjpedersen.bsky.social · 06/08/2026
I have (somehow) reached a new low point in the journal spam I'm getting. I just got an invite from the "Online Journal of Conference Proceedings". They're on the brink of releasing a "highly anticipated issue", and just need my submission by August 10th!
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Eric Pedersen @ericjpedersen.bsky.social · 05/08/2026
In brief: "probability of observing your data" isn't a well-defined statement. For example: the probability of flipping exactly 500 heads out of 1000 from a fair coin is ~2%, but that would not be a useful p-value. Likewise, the probability of observing any specific values from a Normal dist is 0
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Reposted by Eric Pedersen
Danielle Navarro @djnavarro.net · 18/07/2026
And so after a very brief hiatus, version 0.7.0 of "learning statistics with R" exists. Full rebuild in quarto, stylistic fixes, "epilogues from 2026" to comment on how the world changed since original publication, and as an added bonus, no longer misgenders the author learningstatisticswithr.com
learningstatisticswithr.com
Learning Statistics with R
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Eric Pedersen @ericjpedersen.bsky.social · 19/07/2026
"we can't both keep playing 'paper'! I called dibs"
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Ramin Nasibov @nasibov.me · 17/07/2026
I’m so happy for them
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lauren @lauren.rotatingsandwiches.com · 08/07/2026
You just deleted 600 unread emails. Finally, inbox zero. Phew! You refresh the app. There are 600 more unread emails. There will always be 600 more emails. You close your laptop in frustration and look at your phone, only to find there are 600 more emails there too. You cannot escape 600 more emails
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
I've heard of this most commonly in math, econ, chem, and engineering, but I am sure it happens in all fields
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
Ah yes, secret goal #8: validating the instructor's priors about students or vengeance for being made to teach. "You all failing the class proves that I am smarter than my students, and that kids these days are not as talented or hard-working as my generation."
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
I'd call this "cargo cult grading". I've seen cases in undergrad where the prof didn't really bother teaching, the students didn't really bother studying, but since there were grades at the end that followed a curve that roughly matched other classes, learning must have happened, right?
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
Apologies for the ranting :) I've been thinking about these issues a lot this last year when thinking about how to teach post-sabbatical, and I'm taking over as our undergraduate program director this year so it's even more front-and-center on my mind
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
True. There's a secret 7th goal: "I assign grades because that is what I've been told to do, and I won't get in trouble if I do it"
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
Good point (although this might be an example of 1&3, where the desired skill is "ability to thrive in bureaucracy". Given how universities are structured, this is implicitly one of the core skills we want students to have at the end of it
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
Yep, because they are at odds with each other. 1&2 are almost mutually exclusive with #3&4; a "strong" student could do very badly in a poorly taught class and a "weak" student can thrive in a well-taught one Ironically, an instructor can get in trouble if *too many* students learn the material
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
LLMs have shattered this détente because they allow some students to avoid 1-4 + 6 for take-home exams, but they still want the grades to do 3&5. And many students think they are genuinely learning when using LLMs to avoid 6, so they are surprised when they do poorly on in-person evaluations
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
All six goals have coexisted in an uneasy peace because of varying priorities among stakeholders. Typically: instructors value 1/2/6 employers 3/4/ + bit of 1 school admin 2/3/5 students 3&5 We can't design assignments that do all 6 well simultaneously, but we pretended that wasn't the case
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
Forgot to add: 6. incentivize students to try challenging problems / learn new ideas
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
I'm planning on shifting more grade weights to in-person evaluation. I might also switch to giving participation-grades for take-home assignments. I plan to tell students that these are meant as training on how to solve the kinds of problems I expect them to be able to do.
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
I'm not convinced that it's just a tragedy of the commons; there's always been ways to cheat that were hard to prove, but it was relatively rare to see pre-LLMs I think many people don't see using LLMs as cheating, but justify their use as study tools or as shortcuts to "help" with hard problems
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
I think it also breaks applied problem solving. Working through novel problems is proven to be one of the best ways (maybe the only real way) to learn a subject (rather than just memorize), but it's hard to do. Grades were the only tool we had to motivate trying problems, but now that's broken
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
This case highlights a core issue with grades that LLMs have brought to the fore: we are using grades to try to measure/do too many different things: 1. learning+readiness for later material 2. teaching effectiveness 3. Sorting by latent ability 4. Effort put into class 5. as a tool to open doors
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
This isn't a good comparison; Google can't solve a novel problem if you don't have the skills to work through it. The closest previous analog was posting Q's to Stack Overflow or Chegg to have them answer you. The first was slow and unpredictable, the 2nd led to garbage answers that are easy to spot
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Stephen Wild @stephenjwild.bsky.social · 08/07/2026
Today's ragebait for the professors who follow me. 3 points: 1) if I am a student, a take home exam is implicitly open-book. Using ChatGPT is fine and no different. 2) the professor changed the rules after the fact. The students should be pissed 1/2
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
I agree voiding the midterm is extreme and I wouldn't have gone that far, but it does make sense if you want a grade to measure learning. If you were doing a meta-analysis and found out that one study used fake data, isn't it justified in giving that study zero prior weight?
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
Also, if his university is anything like mine, he probably hasn't received much if any guidance on how to adapt teaching to LLMs. As a prof, I feel a bit like a dinosaur watching the meteor approach; all of our best teaching tools are completely voided by LLMs, and it's only going to get worse
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
d) He should have realized this was an issue w/ take-home exams, but I have a hard time blaming him, as I only updated my priors on the strength of LLMs when I tried some test exam questions on Gemini during my sabbatical. They now give A+ answers (whereas it was B- on good Q's 3-4 years ago)
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
c') the prof's response was the best that was available. It is impossible to make a LLM-proof take home assignment now, so we can't use them to evaluate student learning. He didn't lower grades for the midterm, just switched the final eval. Generally this is possible when required and he gave notice
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
b) I've seen a sea change in norms around cheating. During COVID pre-ChatGPT, with online exams, I only detected < 10% of students cheating with online tools. Now it's harder to detect, but given differences between take-home and in-person evaluation, I would guess it's closer to 25% -50%
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Eric Pedersen @ericjpedersen.bsky.social · 08/07/2026
A couple counter-points: a) an open book exam isn't equiv to using LLMs; I didn't see a spike in grades when we did online exams during COVID. If you don't grasp the ideas, having your notes doesn't help you answer a novel Q. LLMs are very different; basically having a 2nd person write the test
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Grant McDermott @gmcd.bsky.social · 03/07/2026
𝐭𝐢𝐧𝐲𝐩𝐥𝐨𝐭 v0.7.0 now available on CRAN 🎉 This is big release, with loads of new features. Same tiny footprint, though ;-) Short highlight thread below, borrowing examples from our gallery: grantmcdermott.com/tinyplot/vig...
https://github.com/grantmcdermott/tinyplot/blob/main/vignettes/gallery_figs/bubble-quakes.Rhttps://github.com/grantmcdermott/tinyplot/blob/main/vignettes/gallery_figs/simpsons-paradox.Rhttps://github.com/grantmcdermott/tinyplot/blob/main/vignettes/gallery_figs/barplot-meat.Rhttps://github.com/grantmcdermott/tinyplot/blob/main/vignettes/gallery_figs/spineplot-titanic.R
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Eric Pedersen @ericjpedersen.bsky.social · 02/07/2026
Good to know! Is it possible to have a default session with common packages precompiled that can be reopened when needed, without having persistent environment?
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Eric Pedersen @ericjpedersen.bsky.social · 02/07/2026
The startup isn't huge if you're spending a few hours coding, but I rarely find time to do that. If I want to quickly spin up a regression model to check something, or make a figure for a paper, the extra compile time was frustrating. May be better now; it was 2 or 3 years ago when I last tried
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Ben Bolker @bbolker.bsky.social · 02/07/2026
I found this surprisingly thoughtful and balanced: r-statistics.co/R-vs-Julia.h... (although some of the labeling on Figure 2 is a little confusing)
r-statistics.co
R vs Julia for Statistics: Julia Is Faster, But Is That What Matters?
Julia benchmarks faster than R on tight loops, but R ships 21,000+ statistical packages and a huge community. Honest trade-offs with real benchmark code.
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