Vianey Leos Barajas's Avatar

Vianey Leos Barajas

@vianeylb

Assistant Professor, Statistical Sciences + School of the Environment at the University of Toronto. Bayesian ecological + environmental stats. Bilingรผe. โœก๏ธ๐ŸŒˆ https://www.vleosbarajas.com

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14.11.2024
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Latest posts by Vianey Leos Barajas @vianeylb

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I might have to change my research to AI so I can work with cat images all day

10.03.2026 19:01 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Best talk of the day, super unbiased of course. #CatLady

Vicente Ordรณรฑez from Rice University

10.03.2026 18:46 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Reminds me of parallel tempering. #BayesLife

10.03.2026 16:14 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Day 2 so far โ€” the Canadians are here!

Vincent Mai from LawZero talking about reinforcement learning.

David Fleet from UofT talking to us about computer vision.

10.03.2026 16:08 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Ca y est ! Le PDF et le eBook sont disponibles GRATUITEMENT ๐Ÿฅณ๐Ÿ˜ www.quae.com/produit/1988... Editions Quae

10.03.2026 07:59 ๐Ÿ‘ 17 ๐Ÿ” 10 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 0
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Long first day but itโ€™s interesting being at an AI conference, my first!

Talk highlight โ€” Decoding Sperm Whale Communication by Orr Paradise.

And of course the presentation on BRUVs for the hackathon!

10.03.2026 00:12 ๐Ÿ‘ 2 ๐Ÿ” 1 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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My first time at SALA, summit of AI in Latin America. So much AI, so much espaรฑol ๐Ÿ™Œ๐Ÿฝ

Excited to help with the hackathon today with Cesar Peรฑaherrera Palma and Jean Lรณpez from MigraMar www.migramar.org/en/index

09.03.2026 16:15 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Once in a while I take my group out to dinners or lunch. As an appreciation of them and a chance to hang together. Weโ€™ve got ๐Ÿ‡ฒ๐Ÿ‡ฝ๐Ÿ‡ฆ๐Ÿ‡ท๐Ÿ‡ง๐Ÿ‡ท๐Ÿ‡จ๐Ÿ‡ฆ๐Ÿ‡ฒ๐Ÿ‡บ covered!

All Bayesian, except for the postdoc thatโ€™s gone rogue and only does AI for ecological monitoring. ๐ŸŸ

04.03.2026 14:48 ๐Ÿ‘ 9 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Home - ISEC 2027 The International Statistical Ecology Conference (ISEC) is the main international gathering of statistical ecologists. It is an inclusive interdisciplinary conference at the interface between statisti...

Call for abstracts is now open for the next International Statistical Ecology Conference (ISEC) taking place on January 8-15, 2027, in Mรฉrida, Mรฉxico!

Abstract submission form can be accessed through the website: statisticalecology.org

Deadline: May 1, 2026 (anywhere on earth)

๐Ÿฆ‹๐Ÿ‡ฒ๐Ÿ‡ฝ๐Ÿ“‰๐Ÿ‘ฉ๐Ÿฝโ€๐Ÿ’ป

24.02.2026 14:50 ๐Ÿ‘ 3 ๐Ÿ” 3 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Book cover for https://oliviergimenez.github.io/banana-book/

Book cover for https://oliviergimenez.github.io/banana-book/

๐Ÿ“˜ New book out soon !

Iโ€™m excited to share that ๐๐š๐ฒ๐ž๐ฌ๐ข๐š๐ง ๐€๐ง๐š๐ฅ๐ฒ๐ฌ๐ข๐ฌ ๐จ๐Ÿ ๐‚๐š๐ฉ๐ญ๐ฎ๐ซ๐ž-๐‘๐ž๐œ๐š๐ฉ๐ญ๐ฎ๐ซ๐ž ๐ƒ๐š๐ญ๐š ๐ฐ๐ข๐ญ๐ก ๐‡๐ข๐๐๐ž๐ง ๐Œ๐š๐ซ๐ค๐จ๐ฏ ๐Œ๐จ๐๐ž๐ฅ๐ฌ: ๐“๐ก๐ž๐จ๐ซ๐ฒ ๐š๐ง๐ ๐‚๐š๐ฌ๐ž ๐’๐ญ๐ฎ๐๐ข๐ž๐ฌ ๐ข๐ง ๐‘ ๐š๐ง๐ ๐๐ˆ๐Œ๐๐‹๐„ is being published by Chapman & Hall / CRC Press

Hope itโ€™s useful to students, researchers, and practitioners

#StatisticalEcology #NIMBLE

01.02.2026 11:38 ๐Ÿ‘ 79 ๐Ÿ” 21 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 0

Nearly 15 years ago, I discovered @isec-stats-ecol.bsky.social as a first year PhD student and knew it was my dream conference/community.

Havenโ€™t missed one since & now I get to bring it to Mรฉxico. Que padre unir mi comunidad acadรฉmica y mi gente ๐Ÿ‡ฒ๐Ÿ‡ฝ ๐ŸŒŽ

bsky.app/profile/isec...

20.02.2026 21:58 ๐Ÿ‘ 6 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Home - ISEC 2027 The International Statistical Ecology Conference (ISEC) is the main international gathering of statistical ecologists. It is an inclusive interdisciplinary conference at the interface between statisti...

BTW, ISEC 2027 call for abstracts now open: statisticalecology.org

20.02.2026 15:14 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Organizing a conference can be a bit stressful, but sending mass emails when my cat likes to jump on my keyboard just as I'm about to hit send....complete panic.

The culprit:

20.02.2026 15:14 ๐Ÿ‘ 6 ๐Ÿ” 0 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 0
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ISEC 2027 will offer 14(!) workshops over the course of 2 days, Jan 8-9, 2027.

Incredibly excited & thankful to all of our instructors. ๐Ÿฆ‹๐Ÿ‡ฒ๐Ÿ‡ฝ๐Ÿ“‰๐Ÿ‘ฉ๐Ÿฝโ€๐Ÿ’ป

Check out the workshop titles on the main page, statisticalecology.org, and full information here: statisticalecology.org?page_id=742

19.02.2026 19:05 ๐Ÿ‘ 1 ๐Ÿ” 1 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 1
Preview
StanCon 2026 Oral presentation deadline (25th of February) Hi all, Just a quick reminder for StanCon 2026 (Uppsala, 17โ€“21 August): if youโ€™re planning to give an oral presentation, the submission deadline is 25 February (AoE). If you have a talk in mind, plea...

๐Ÿ”ฅ๐Ÿ”ฅ StanCon 2026 Oral Presentation Submission Deadline on the 25th of February ๐Ÿ”ฅ๐Ÿ”ฅ

discourse.mc-stan.org/t/stancon-20...

18.02.2026 18:23 ๐Ÿ‘ 6 ๐Ÿ” 4 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

A lot of Bayesian workshops โ€” I would like to state publicly that I didnโ€™t plan it this way, itโ€™s just a happy coincidence ๐Ÿ˜น

17.02.2026 14:56 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Workshops - ISEC 2027 Workshop Descriptions The following workshops will be given at the International Statistical Ecology Conference over the course of two days, January 8-9 2027. Workshops denoted with a * include instru...

statisticalecology.org?page_id=742 ๐Ÿ‘€๐Ÿ‘€

17.02.2026 14:55 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
The fifth annual Cherry Blossom Prediction Competition is open! | Statistical Modeling, Causal Inference, and Social Science

The fifth annual Cherry Blossom Prediction Competition is open!
statmodeling.stat.columbia.edu/2026/02/11/t...

12.02.2026 01:24 ๐Ÿ‘ 5 ๐Ÿ” 2 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Home - ISEC 2027 The International Statistical Ecology Conference (ISEC) is the main international gathering of statistical ecologists. It is an inclusive interdisciplinary conference at the interface between statisti...

Slowly populating the ISEC website with accepted workshop info, if anyone wants to take a peek ๐Ÿ‘€ statisticalecology.org

Official announcements & full info coming next week.

11.02.2026 14:29 ๐Ÿ‘ 7 ๐Ÿ” 1 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

This conference looks incredible. Major FOMO.

11.02.2026 12:33 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

ISEC 2027 is going to be starting strong!

11.02.2026 03:27 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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New special feature!๐ŸŒ๐Ÿงช

Here, our guest editors research at the cutting edge of the AIโ€“ecology interface, focusing on work that advances the state of both fields beyond proof-of-concept to true interdisciplinary insight.

Read the full collection๐Ÿ‘‡๏ธ

buff.ly/GbMxxmW

09.02.2026 08:30 ๐Ÿ‘ 7 ๐Ÿ” 5 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
LISTEN: Dr. Marie Auger-Methe talks to @cbcquirks about the state of Canadian #polarbears. 
https://www.cbc.ca/radio/quirks/jan-31-polar-bears-thrive-9.7068518 

Image by Monica Max West/Pixabay

LISTEN: Dr. Marie Auger-Methe talks to @cbcquirks about the state of Canadian #polarbears. https://www.cbc.ca/radio/quirks/jan-31-polar-bears-thrive-9.7068518 Image by Monica Max West/Pixabay

LISTEN: Dr. Marie Auger-Methe talks to @CBC's Quirks & Quarks about the state of Canadian #polarbears.
www.cbc.ca/radio/quirks...

06.02.2026 18:02 ๐Ÿ‘ 14 ๐Ÿ” 4 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Preview
Species distribution modeling with expert elicitation and Bayesian calibration Species distribution models (SDM) are key tools in ecology, conservation, and natural resources management. They are traditionally trained with data on direct species observations. However, if collec....

Ever wondered how to use supra-Bayesian approach in species distribution modeling (SMDs). Well we present a framework for it and exemplify it with real data on fish reproduction area estimation.

nsojournals.onlinelibrary.wiley.com/doi/10.1002/...
1/3

06.02.2026 14:44 ๐Ÿ‘ 6 ๐Ÿ” 4 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
StanCon 20206
International Conferene on Bayesian Inference and Probabilistic Programming
17-21 August, 2026
Uppsala, Sweden

StanCon 20206 International Conferene on Bayesian Inference and Probabilistic Programming 17-21 August, 2026 Uppsala, Sweden

Three weeks time to submit contributed talk abstract to StanCon 2026! You can also submit a poster abstract early, if you need to make early travel plans. There will be travel and accommodation support for students, too!

More information about submitting at www.stancon2026.org/abstracts/

04.02.2026 15:55 ๐Ÿ‘ 6 ๐Ÿ” 3 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
| ISI

#EnviBayes are pleased to have teamed up with LACSC, TIES, and ENVR to co-organise the International Conference on Statistics, Data Science, and Computing for the Environment and Climate Change: 07 Dec 2026 - 11 Dec 2026 at UNAM, Mexico City. See website for details:

isi-web.org/event-detail...

04.02.2026 13:33 ๐Ÿ‘ 3 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
The Greening of Religion Hypothesis posits that faith communities are in a process of transformation to become environmentally responsible. This project introduces a data science-driven framework to systematically measure such action across thousands of places of worship.
$100,00
DATA SCIENCES INSTITUTE (DSI)
CATALYST GRANT
Meredith Franklin.
Tanhum Yoreh.
Vianey Leos Barajas
A DATA SCIENCE FRAMEWORK
FOR QUANTIFYING
ENVIRONMENTAL ACTION IN FAITH
COMMUNITIES

The Greening of Religion Hypothesis posits that faith communities are in a process of transformation to become environmentally responsible. This project introduces a data science-driven framework to systematically measure such action across thousands of places of worship. $100,00 DATA SCIENCES INSTITUTE (DSI) CATALYST GRANT Meredith Franklin. Tanhum Yoreh. Vianey Leos Barajas A DATA SCIENCE FRAMEWORK FOR QUANTIFYING ENVIRONMENTAL ACTION IN FAITH COMMUNITIES

The most unexpected collaboration thus far in my career but itโ€™s fun. We just got a grant to work on:

โ€œA data science framework for quantifying environmental action in faith communitiesโ€

27.01.2026 18:40 ๐Ÿ‘ 3 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
**Part 1: From Bayesian inference to Bayesian workflow**

1. Bayesian theory and Bayesian practice
2. Statistical modeling and workflow
3. Computational tools
4. Introduction to workflow: Modeling performance on a multiple choice exam

**Part 2: Statistical workflow**

5. Building statistical models
6. Using simulations to capture uncertainty
7. Prediction, generalization, and causal inference
8. Visualizing and checking fitted models
9. Comparing and improving models
10. Statistical inference and scientific inference

**Part 3: Computational workflow**

11. Fitting statistical models
12. Diagnosing and fixing problems with fitting
13. Approximate algorithms and approximate models
14. Simulation-based calibration checking
15. Statistical modeling as software development

**Part 1: From Bayesian inference to Bayesian workflow** 1. Bayesian theory and Bayesian practice 2. Statistical modeling and workflow 3. Computational tools 4. Introduction to workflow: Modeling performance on a multiple choice exam **Part 2: Statistical workflow** 5. Building statistical models 6. Using simulations to capture uncertainty 7. Prediction, generalization, and causal inference 8. Visualizing and checking fitted models 9. Comparing and improving models 10. Statistical inference and scientific inference **Part 3: Computational workflow** 11. Fitting statistical models 12. Diagnosing and fixing problems with fitting 13. Approximate algorithms and approximate models 14. Simulation-based calibration checking 15. Statistical modeling as software development

**4. Case studies**

16. Coding a series of models: Simulated data of movie ratings
17. Prior specification for regression models: Reanalysis of a sleep study
18. Predictive model checking and comparison: Clinical trial
19. Building up to a hierarchical model: Coronavirus testing
20. Using a fitted model for decision analysis: Mixture model for time series competition
21. Posterior predictive checking: Stochastic learning in dogs
22. Incremental development and testing: Black cat adoptions
23. Debugging a model: World Cup football
24. Leave-one-out cross validation model checking and comparison: Roaches
25. Model building and expansion: Golf putting
26. Model building with latent variables: Markov models for animal movement
27. Model building: Time-series decomposition for birthdays
28. Models for regression coefficients and variable selection: Student grades
29. Sampling problems with latent variables: No vehicles in the park
30. Challenge of multimodality: Differential equation for planetary motion
31. Simulation-based calibration checking in model development workflow

**Appendices**

A. Statistical and computational workflow for Bayesians and non-Bayesians
B. How to get the most out of Bayesian Data Analysis

**4. Case studies** 16. Coding a series of models: Simulated data of movie ratings 17. Prior specification for regression models: Reanalysis of a sleep study 18. Predictive model checking and comparison: Clinical trial 19. Building up to a hierarchical model: Coronavirus testing 20. Using a fitted model for decision analysis: Mixture model for time series competition 21. Posterior predictive checking: Stochastic learning in dogs 22. Incremental development and testing: Black cat adoptions 23. Debugging a model: World Cup football 24. Leave-one-out cross validation model checking and comparison: Roaches 25. Model building and expansion: Golf putting 26. Model building with latent variables: Markov models for animal movement 27. Model building: Time-series decomposition for birthdays 28. Models for regression coefficients and variable selection: Student grades 29. Sampling problems with latent variables: No vehicles in the park 30. Challenge of multimodality: Differential equation for planetary motion 31. Simulation-based calibration checking in model development workflow **Appendices** A. Statistical and computational workflow for Bayesians and non-Bayesians B. How to get the most out of Bayesian Data Analysis

Bayesian Workflow by
Andrew Gelman, Aki Vehtari, @rmcelreath.bsky.social with @danpsimpson.bsky.social, @charlesm993.bsky.social, @yulingy.bsky.social, Lauren Kennedy, Jonah Gabry, @paulbuerkner.com, @modrakm.bsky.social, @vianeylb.bsky.social

(in production, estimated copy-editing time 6 weeks)

26.01.2026 08:18 ๐Ÿ‘ 159 ๐Ÿ” 31 ๐Ÿ’ฌ 3 ๐Ÿ“Œ 4
A hex sticker with a text that reads Hello Data Science with green, yellow and pink scatterplot points in the background. There is a web address www.hellodata.science

A hex sticker with a text that reads Hello Data Science with green, yellow and pink scatterplot points in the background. There is a web address www.hellodata.science

๐Ÿ“– Big news! We just released the first five chapters of our new book, Hello Data Science. It is a fully open-access resource written for beginners. Please help us spread the word! A few points about the book are below ๐Ÿ‘‡

๐Ÿ”— www.hellodata.science

#rstats #datascience #tidyverse

14.01.2026 05:34 ๐Ÿ‘ 195 ๐Ÿ” 81 ๐Ÿ’ฌ 4 ๐Ÿ“Œ 2
Extinction risk and the spatial patterning of shark, ray and chimaera richness, including hotspots of coastal and deepwater richness, for wide-ranging and endemic species.

Extinction risk and the spatial patterning of shark, ray and chimaera richness, including hotspots of coastal and deepwater richness, for wide-ranging and endemic species.

Sharks & rays are sentinels of ocean health.

- Global abundance has been fished down by 65%,
- Now 37.5% of species are threatened,
- The current extinction rate is 25โ€“250 times greater than the background fossil record, with greatest losses in tropical coastal seas. #BiodiversityTargets

22.01.2026 03:34 ๐Ÿ‘ 19 ๐Ÿ” 11 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0