Carl F. Falk
@cffalk.bsky.social
Associate Professor | Quantitative Psychologist | Psychometrician
https://www.psych.mcgill.ca/perpg/fac/falk/
https://scholar.google.com/citations?user=9BA_cL0AAAAJ
https://www.psych.mcgill.ca/perpg/fac/falk/
https://scholar.google.com/citations?user=9BA_cL0AAAAJ
Pinned
Carl F. Falk
@cffalk.bsky.social
· Jul 28
If you do survey research with Likert-type items and worry about random responders, Michael John Ilagan & I made a Shiny app we think some of you may like.
falkcarl.shinyapps.io/BotApp1/
#SurveyResearch #DataQuality #Psychometrics #OnlineSurveys #SurveyBots #RandomResponders #rstats #Shiny
falkcarl.shinyapps.io/BotApp1/
#SurveyResearch #DataQuality #Psychometrics #OnlineSurveys #SurveyBots #RandomResponders #rstats #Shiny
Reposted by Carl F. Falk
Now I'm also looking for a research software engineer to implement a pile of research results to R packages loo, posterior, bayesplot, projpred, priorsense, brms or/and Python packages ArviZ, Bambi and Kulprit. Apply by email with no specific deadline (see contact info at users.aalto.fi/~ave/)
I'm now also looking for a postdoc with strong Bayesian background and interest in developing Bayesian cross-validation theory, methods and software. Apply by email with no specific deadline (see contact information at users.aalto.fi/~ave/).
Others, please share
Others, please share
I'm looking for a doctoral student with Bayesian background to work on Bayesian workflow and cross-validation (see my publication list users.aalto.fi/~ave/publica... for my recent work) at Aalto University.
Apply through the ELLIS PhD program (dl October 31) ellis.eu/news/ellis-p...
Apply through the ELLIS PhD program (dl October 31) ellis.eu/news/ellis-p...
November 3, 2025 at 11:13 AM
Now I'm also looking for a research software engineer to implement a pile of research results to R packages loo, posterior, bayesplot, projpred, priorsense, brms or/and Python packages ArviZ, Bambi and Kulprit. Apply by email with no specific deadline (see contact info at users.aalto.fi/~ave/)
FYI.
The House of Commons committee where this went down also records the meetings: www.ourcommons.ca/Committees/e...
The House of Commons committee where this went down also records the meetings: www.ourcommons.ca/Committees/e...
November 2, 2025 at 12:53 AM
FYI.
The House of Commons committee where this went down also records the meetings: www.ourcommons.ca/Committees/e...
The House of Commons committee where this went down also records the meetings: www.ourcommons.ca/Committees/e...
Reposted by Carl F. Falk
I'm now also looking for a postdoc with strong Bayesian background and interest in developing Bayesian cross-validation theory, methods and software. Apply by email with no specific deadline (see contact information at users.aalto.fi/~ave/).
Others, please share
Others, please share
I'm looking for a doctoral student with Bayesian background to work on Bayesian workflow and cross-validation (see my publication list users.aalto.fi/~ave/publica... for my recent work) at Aalto University.
Apply through the ELLIS PhD program (dl October 31) ellis.eu/news/ellis-p...
Apply through the ELLIS PhD program (dl October 31) ellis.eu/news/ellis-p...
ELLIS PhD Program: Call for Applications 2025
The ELLIS mission is to create a diverse European network that promotes research excellence and advances breakthroughs in AI, as well as a pan-European PhD program to educate the next generation of AI...
ellis.eu
October 29, 2025 at 2:37 PM
I'm now also looking for a postdoc with strong Bayesian background and interest in developing Bayesian cross-validation theory, methods and software. Apply by email with no specific deadline (see contact information at users.aalto.fi/~ave/).
Others, please share
Others, please share
Reposted by Carl F. Falk
When there is a random way to do something, there is a less random way that is better but requires more thought. In this case, regression models that make no sense don't belong in a multiverse analysis. An inferential regression without a causal justification is like an opinion without reasons.
October 23, 2025 at 4:34 PM
When there is a random way to do something, there is a less random way that is better but requires more thought. In this case, regression models that make no sense don't belong in a multiverse analysis. An inferential regression without a causal justification is like an opinion without reasons.
Anyone else using #shinylive with #rstats having trouble getting nice plotting packages like #ggplot2 or #plotly to work? Curious what work arounds there are. Many thanks! ( #shiny works fine)
October 22, 2025 at 10:39 PM
Anyone else using #shinylive with #rstats having trouble getting nice plotting packages like #ggplot2 or #plotly to work? Curious what work arounds there are. Many thanks! ( #shiny works fine)
Reposted by Carl F. Falk
Join us as we explore our options, tomorrow….
October 20, 2025 at 12:52 PM
Join us as we explore our options, tomorrow….
Reposted by Carl F. Falk
There is still time to submit a proposal to host IMPS 2028! Visit www.psychometricsociety.org/hosting-oppo... for details. #QuantitativePsychology #Psychometrics
October 16, 2025 at 1:52 PM
There is still time to submit a proposal to host IMPS 2028! Visit www.psychometricsociety.org/hosting-oppo... for details. #QuantitativePsychology #Psychometrics
Reposted by Carl F. Falk
I clearly had a lot of thoughts/feelings from reading Terry's blog post, so I wrote one of my own
It ended up being a bit of a stream-of-thought post but I think it captures some of my worries
benharrap.com/post/2025-10...
#statssky #episky #academicsky
It ended up being a bit of a stream-of-thought post but I think it captures some of my worries
benharrap.com/post/2025-10...
#statssky #episky #academicsky
October 10, 2025 at 1:05 AM
I clearly had a lot of thoughts/feelings from reading Terry's blog post, so I wrote one of my own
It ended up being a bit of a stream-of-thought post but I think it captures some of my worries
benharrap.com/post/2025-10...
#statssky #episky #academicsky
It ended up being a bit of a stream-of-thought post but I think it captures some of my worries
benharrap.com/post/2025-10...
#statssky #episky #academicsky
Would sure be funny to embed certain keyword combinations into assignments to mess with cheating students who then copy the questions into an LLM prompt.
October 10, 2025 at 1:44 AM
Would sure be funny to embed certain keyword combinations into assignments to mess with cheating students who then copy the questions into an LLM prompt.
Reposted by Carl F. Falk
🚨 R developers, apply now!
The R Consortium ISC has opened its 2025 Cycle 2 grant window!
💡 Got an idea that helps the R community? Package it, submit it, and get funded.
🗓 Deadline: Oct 1, 2025
📍 Apply: r-consortium.org/all-projects...
Make your mark on #rstats 🚀
The R Consortium ISC has opened its 2025 Cycle 2 grant window!
💡 Got an idea that helps the R community? Package it, submit it, and get funded.
🗓 Deadline: Oct 1, 2025
📍 Apply: r-consortium.org/all-projects...
Make your mark on #rstats 🚀
September 2, 2025 at 9:10 PM
🚨 R developers, apply now!
The R Consortium ISC has opened its 2025 Cycle 2 grant window!
💡 Got an idea that helps the R community? Package it, submit it, and get funded.
🗓 Deadline: Oct 1, 2025
📍 Apply: r-consortium.org/all-projects...
Make your mark on #rstats 🚀
The R Consortium ISC has opened its 2025 Cycle 2 grant window!
💡 Got an idea that helps the R community? Package it, submit it, and get funded.
🗓 Deadline: Oct 1, 2025
📍 Apply: r-consortium.org/all-projects...
Make your mark on #rstats 🚀
Reposted by Carl F. Falk
WE ARE HIRING! 2 Lecturers in Quantitative Social Science. Want a friendly interdisciplinary department in one of the world's most vibrant cities? This just might be for you.
Apply by: 10 Oct
www.ucl.ac.uk/work-at-ucl/...
Apply by: 10 Oct
www.ucl.ac.uk/work-at-ucl/...
September 1, 2025 at 1:59 PM
WE ARE HIRING! 2 Lecturers in Quantitative Social Science. Want a friendly interdisciplinary department in one of the world's most vibrant cities? This just might be for you.
Apply by: 10 Oct
www.ucl.ac.uk/work-at-ucl/...
Apply by: 10 Oct
www.ucl.ac.uk/work-at-ucl/...
Reposted by Carl F. Falk
Excited to announce that our paper with @pingfanhu.bsky.social and Bogdan Bunea on our #rstats package {surveydown} is now published in @plosone.org
The paper compares the benefits of using a code-based approach to survey design, leveraging #quarto and #shiny
journals.plos.org/plosone/arti...
The paper compares the benefits of using a code-based approach to survey design, leveraging #quarto and #shiny
journals.plos.org/plosone/arti...
surveydown: An open-source, markdown-based platform for programmable and reproducible surveys
This paper introduces the surveydown survey platform. With surveydown, researchers can create surveys that are programmable and reproducible using markdown and R code, leveraging the Quarto publicatio...
journals.plos.org
August 29, 2025 at 8:37 PM
Excited to announce that our paper with @pingfanhu.bsky.social and Bogdan Bunea on our #rstats package {surveydown} is now published in @plosone.org
The paper compares the benefits of using a code-based approach to survey design, leveraging #quarto and #shiny
journals.plos.org/plosone/arti...
The paper compares the benefits of using a code-based approach to survey design, leveraging #quarto and #shiny
journals.plos.org/plosone/arti...
Reposted by Carl F. Falk
The University of Central Florida College of Medicine is looking to hire a Psychometrician (Assistant or Associate Professor of Medicine).
Learn more: www.click2apply.net/OJJDagiDEDql...
#NCMECareers
Learn more: www.click2apply.net/OJJDagiDEDql...
#NCMECareers
Psychometrician (Assistant or Associate Professor of Medicine)
The Opportunity The University of Central Florida College of Medicine (UCF-COM) is seeking a Psychometrician. This is a full-time (1.0FTE) non-tenure earning assistant professor of medicine or associa...
www.click2apply.net
August 29, 2025 at 8:02 PM
The University of Central Florida College of Medicine is looking to hire a Psychometrician (Assistant or Associate Professor of Medicine).
Learn more: www.click2apply.net/OJJDagiDEDql...
#NCMECareers
Learn more: www.click2apply.net/OJJDagiDEDql...
#NCMECareers
I'd also be curious to know what people use
Anyone have favorite options for printing SEM output in R like semTable that work for v4.5.1? My Googling has turned up little.
August 21, 2025 at 7:31 PM
I'd also be curious to know what people use
Reposted by Carl F. Falk
Bridge sampling estimates marginal likelihood. A recommendation has been to use an order of magnitude more posterior draws than otherwise.
With Giorgio Micaletto we show how to compute MCSE for bridge sampling to decide how many draws are actually needed arxiv.org/abs/2508.14487
With Giorgio Micaletto we show how to compute MCSE for bridge sampling to decide how many draws are actually needed arxiv.org/abs/2508.14487
Bridge Sampling Diagnostics
In Bayesian statistics, the marginal likelihood is used for model selection and averaging, yet it is often challenging to compute accurately for complex models. Approaches such as bridge sampling, whi...
arxiv.org
August 21, 2025 at 5:04 PM
Bridge sampling estimates marginal likelihood. A recommendation has been to use an order of magnitude more posterior draws than otherwise.
With Giorgio Micaletto we show how to compute MCSE for bridge sampling to decide how many draws are actually needed arxiv.org/abs/2508.14487
With Giorgio Micaletto we show how to compute MCSE for bridge sampling to decide how many draws are actually needed arxiv.org/abs/2508.14487
Considering EBICglasso for network modeling, but have a lot of missing data? A recent paper (accepted at Multivariate Behavioral Research), osf.io/preprints/os... may help. The paper is a bit technical, so a new blog post focuses on software: www.psych.mcgill.ca/perpg/fac/fa...
#rstats #quantpsych
#rstats #quantpsych
August 21, 2025 at 3:44 PM
Considering EBICglasso for network modeling, but have a lot of missing data? A recent paper (accepted at Multivariate Behavioral Research), osf.io/preprints/os... may help. The paper is a bit technical, so a new blog post focuses on software: www.psych.mcgill.ca/perpg/fac/fa...
#rstats #quantpsych
#rstats #quantpsych
Reposted by Carl F. Falk
This is the definition of a failed social media platform.
August 20, 2025 at 1:41 PM
This is the definition of a failed social media platform.
Reposted by Carl F. Falk
You have been thinking about Canada. So just do it. careers.ucalgary.ca/jobs/1661564...
Assistant Professor, Industrial & Organizational Psychology in
Calgary,
AB,
...
Assistant Professor, Industrial & Organizational Psychology in
Calgary,
AB,
...
careers.ucalgary.ca
August 21, 2025 at 1:07 AM
You have been thinking about Canada. So just do it. careers.ucalgary.ca/jobs/1661564...
Reposted by Carl F. Falk
My dept at the University of Auckland (NZ) will be hiring in social psych at the junior level this cycle. Official ad to follow
It's a big research-active dept with fun colleagues, plus you can commute to uni on a boat, paired with a pleasant walk thru Albert Park (this pic from heading home today)
It's a big research-active dept with fun colleagues, plus you can commute to uni on a boat, paired with a pleasant walk thru Albert Park (this pic from heading home today)
August 20, 2025 at 6:47 AM
My dept at the University of Auckland (NZ) will be hiring in social psych at the junior level this cycle. Official ad to follow
It's a big research-active dept with fun colleagues, plus you can commute to uni on a boat, paired with a pleasant walk thru Albert Park (this pic from heading home today)
It's a big research-active dept with fun colleagues, plus you can commute to uni on a boat, paired with a pleasant walk thru Albert Park (this pic from heading home today)
Reposted by Carl F. Falk
Mark your calendars: IMPS 2026 will be at Yonsei University in Seoul, Republic of Korea, from July 21-24, with short courses on July 20.
Updates will be posted to the conference website: www.psychometricsociety.org/imps-2026
#IMPS2026 #Psychometrics #QuantitativePsychology
Updates will be posted to the conference website: www.psychometricsociety.org/imps-2026
#IMPS2026 #Psychometrics #QuantitativePsychology
IMPS 2026 - Psychometric Society
July 21-24 (Short Courses July 20)
www.psychometricsociety.org
August 18, 2025 at 6:49 PM
Mark your calendars: IMPS 2026 will be at Yonsei University in Seoul, Republic of Korea, from July 21-24, with short courses on July 20.
Updates will be posted to the conference website: www.psychometricsociety.org/imps-2026
#IMPS2026 #Psychometrics #QuantitativePsychology
Updates will be posted to the conference website: www.psychometricsociety.org/imps-2026
#IMPS2026 #Psychometrics #QuantitativePsychology
Reposted by Carl F. Falk
Happy to announce ✨quarto-revealjs-editable✨
This fully supersedes the imagemover extension, as I back then didn't realize the potential. You can now also move, resize, change font size and alignment for text in your slides
github.com/EmilHvitfeld...
#quarto #slidecrafting
This fully supersedes the imagemover extension, as I back then didn't realize the potential. You can now also move, resize, change font size and alignment for text in your slides
github.com/EmilHvitfeld...
#quarto #slidecrafting
August 20, 2025 at 5:39 PM
Happy to announce ✨quarto-revealjs-editable✨
This fully supersedes the imagemover extension, as I back then didn't realize the potential. You can now also move, resize, change font size and alignment for text in your slides
github.com/EmilHvitfeld...
#quarto #slidecrafting
This fully supersedes the imagemover extension, as I back then didn't realize the potential. You can now also move, resize, change font size and alignment for text in your slides
github.com/EmilHvitfeld...
#quarto #slidecrafting
Reposted by Carl F. Falk
Now on CRAN, ggdiagram is a #ggplot2 extension that draws diagrams programmatically in #Rstats. Allows for precise control in how objects, labels, and equations are placed in relation to each other.
wjschne.github.io/ggdiagram/ar...
wjschne.github.io/ggdiagram/ar...
August 20, 2025 at 10:43 AM
Now on CRAN, ggdiagram is a #ggplot2 extension that draws diagrams programmatically in #Rstats. Allows for precise control in how objects, labels, and equations are placed in relation to each other.
wjschne.github.io/ggdiagram/ar...
wjschne.github.io/ggdiagram/ar...
Reposted by Carl F. Falk
I've written a short blog post about the process of switching my personal website from Hugo to Quarto, some of the tricky things, and advice for those thinking about doing the same!
Link: nrennie.rbind.io/blog/hugo-qu...
#RStats #QuartoPub
Link: nrennie.rbind.io/blog/hugo-qu...
#RStats #QuartoPub
Switching my website from Hugo to Quarto – Nicola Rennie
Having recently converted my personal website from Hugo to Quarto, this blog post explains the motivation behind it, the things that were tricky to switch, and some tips if you’re thinking about doing...
nrennie.rbind.io
July 29, 2025 at 3:12 PM
I've written a short blog post about the process of switching my personal website from Hugo to Quarto, some of the tricky things, and advice for those thinking about doing the same!
Link: nrennie.rbind.io/blog/hugo-qu...
#RStats #QuartoPub
Link: nrennie.rbind.io/blog/hugo-qu...
#RStats #QuartoPub
If you do survey research with Likert-type items and worry about random responders, Michael John Ilagan & I made a Shiny app we think some of you may like.
falkcarl.shinyapps.io/BotApp1/
#SurveyResearch #DataQuality #Psychometrics #OnlineSurveys #SurveyBots #RandomResponders #rstats #Shiny
falkcarl.shinyapps.io/BotApp1/
#SurveyResearch #DataQuality #Psychometrics #OnlineSurveys #SurveyBots #RandomResponders #rstats #Shiny
July 28, 2025 at 2:13 PM
If you do survey research with Likert-type items and worry about random responders, Michael John Ilagan & I made a Shiny app we think some of you may like.
falkcarl.shinyapps.io/BotApp1/
#SurveyResearch #DataQuality #Psychometrics #OnlineSurveys #SurveyBots #RandomResponders #rstats #Shiny
falkcarl.shinyapps.io/BotApp1/
#SurveyResearch #DataQuality #Psychometrics #OnlineSurveys #SurveyBots #RandomResponders #rstats #Shiny