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Peder M Isager @isager.bsky.social · 11/08/2026

Perspectives on Scientific Error 2027 is heading to Copenhagen, Jan 27th to 29th PSE brings together philosophers of science, statisticians and metascientists around 1 question: how do errors get into the scientific record, and what can we do about them? Register your interest at errorsin.science

errorsin.science

Perspectives on Scientific Error 2027 · PSE9

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Constantin Späth @cspaeth.bsky.social · 08/07/2026

@isager.bsky.social I just saw that you illustrated a thought experiment ("Insomnia Treatment Experiment") when explaining power planning for TST. But also in this example it is basically (inductively informed) guesswork, isn't it? -> journals.sagepub.com/doi/full/10....

journals.sagepub.com

Three-Sided Testing to Establish Practical Significance: A Tutorial - Peder Mortvedt Isager, Jack Fitzgerald, 2026

Researchers may want to know whether an observed statistical relationship is either meaningfully negative, meaningfully positive, or small enough to be consider...

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Melissa Kline Struhl @mekline.bsky.social · 05/05/2026

Psych-DS is spellcheck for your datasets, and it has an R package now! Available in beta now, made by the excellent Brian Leonard, instructions here: psych-ds.github.io/psychds-r/

Screenshot of the "Create Dataset" page of the psych-DS Shiny app from the new R package psychds

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Peder M Isager @isager.bsky.social · 28/04/2026

My article "Three-Sided Testing to Establish Practical Significance" with @jackfitzgerald.bsky.social is now published in AMPPS! journals.sagepub.com/doi/10.1177/... Three-sided testing is an improved version of TOST that lets you test for equivalence, superiority and inferiority simultaneously.

journals.sagepub.com

Sage Journals: Discover world-class research

Subscription and open access journals from Sage, the world's leading independent academic publisher.

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Daniel Lakens @lakens.bsky.social · 30/01/2026

New episode of Nullius In Verba! We discuss the jingle-jangle fallacy, the problem of vague concepts, how the incentive structures promote vagueness, why people who prefer more rigour have to be called the validity 'police', and much more! nulliusinverba.podbean.com/e/episode-74...

nulliusinverba.podbean.com

Episode 74: Notiones Vague | Nullius in Verba

In this episode, we discuss the problems associated with vague concepts in psychological science. We talk about the jingle-jangle fallacy, the trade-off between broad concepts and more precise…

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Julia M. Rohrer @dingdingpeng.the100.ci · 29/01/2026

Just learned about this study looking at methodological trends in psych and econ over time: online.ucpress.edu/collabra/art.... Matches my perception well: Nobody in psych bothers to (explicitly) try causal inference unless they conducted an experiment, not a lot of theoretical work either.

Figure 1 from the paper.
Econ: from 2008 to 2024, methods aiming for causal inference have increased, theoretical work has decreased.
Psych: Mostly experimental or descriptive correlational work.

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Peder M Isager @isager.bsky.social · 28/01/2026

New blog post introducing Causion - a web app for causal inference teaching and learning: pedermisager.org/blog/causion....

pedermisager.org

Introducing Causion: A web app for playing with DAGs | Peder M. Isager

Personal website of Dr. Peder M. Isager

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Peder M Isager @isager.bsky.social · 28/01/2026

New blog post introducing Causion - a web app for causal inference teaching and learning: pedermisager.org/blog/causion....

pedermisager.org

Introducing Causion: A web app for playing with DAGs | Peder M. Isager

Personal website of Dr. Peder M. Isager

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Björn E. Hommel @bjoernhommel.bsky.social · 26/11/2025

🚨 SynthNet is out 🚨 Researchers propose new constructs and measures faster than anyone can track. We (@anniria.bsky.social @ruben.the100.ci) built a search engine to check what already exists and help identify redundancies; indexing 74,000 scales from ~31,500 instruments in APA PsycTests. 🧵1/3

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Peder M Isager @isager.bsky.social · 17/11/2025

New blog post! ”Which variables to control for, and why”: pedermisager.org/blog/which-v... In this post I give a beginner-friendly introduction to causal inference and statistical control, explaining why adjusting for the right variables clarifies relationships >

pedermisager.org

Which variables to control for, and why | Peder M. Isager

Personal website of Dr. Peder M. Isager

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Raphael Merz @raphaelmerz.bsky.social · 13/11/2025

Join the next PMGS workshop where @ambra-prg.bsky.social will explain how to use Quarto for your reproducible research! 🔓🧑‍🔬

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Peder M Isager @isager.bsky.social · 30/10/2025

My paper with @lakens.bsky.social and @annaveer.bsky.social - “Replication value as a function of citation impact and sample size” - has just been published in Meta psychology! open.lnu.se/index.php/me...

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Ruben C. Arslan @ruben.the100.ci · 28/10/2025

I built a DAG diagram with garden hoses for teaching. Pictured: a collider bias diagram, inspired by a blocked pipe situation I experienced (which I credit with giving me the intuition though it also ruined my belongings in the flooded cellar).

me with some garden hoses connected in a X -> Z <- Y fashion. If I shut the valve at Z, water from X spills out at Y

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Peder M Isager @isager.bsky.social · 26/09/2025

Extremely honored to recieve Oslo New University College's science award for 2025. ONH has been a fantastic base to conduct my research at for the past 4 years, and I have an amazing team of colleagues around me to thank for that. From the bottom of my heart, thank you all!

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Julia M. Rohrer @dingdingpeng.the100.ci · 19/08/2025

Okay everyone, things are getting serious. I’m going to teach research methods again, 1st year psychology undergraduates. What would you cover with respects to philosophy of science, the research process etc.? I’m not very happy with the textbook stuff so I’m open to all ideas!

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Daniel Lakens @lakens.bsky.social · 15/08/2025

An abbreviation (ABB) in a journal article (JA) or Grant Application (GA) is rarely worth the words it saves. Every ABB requires cognitive resources (CR) and at my age by the time I'm halfway through a JA or GA I no longer have the CR to remember what your ABB stood for.

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Peder M Isager @isager.bsky.social · 14/08/2025

Can we infer causal relations from undirected network models of mental disorders? Some authors apparently say no. Personally, I don't see what network models are good for if they can't help us understand disease etiology (i.e. causality). Quote from onlinelibrary.wiley.com/doi/10.1002/...

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Peder M Isager @isager.bsky.social · 08/08/2025

New blog post! Why experiments are the gold standard for answering causal questions (pedermisager.org/blog/why-exp...). Many text books insist on experimental evidence to draw causal inferences bvut don't fully explain exactly what gives experiments their special powers.

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Peder M Isager @isager.bsky.social · 01/07/2025

RE @nulliusinverba.bsky.social ep 59: Meehl seems to assume that research is harder than teaching; teachers should be paid less and if you can't do interesting research you're "demoted" to teaching. Why not the opposite? Why not pay teachers more and say "if you cannot teach, do"?

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Peder M Isager @isager.bsky.social · 01/07/2025

Currently reading "Complex Systems Research in Psychology" (santafeinstitute.github.io/ComplexPsych/). If you're interested systems psychology/psychopathology, give this a read. van der Maas gives a very broad introduction to the topic, and supplements text with R code and practical exercises.

santafeinstitute.github.io

Complex Systems Research in Psychology

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Daniel Lakens @lakens.bsky.social · 26/06/2025

I often talk about the need for psychology to improve. That is because I think it is worth improving. It would be very helpful if I could easily provide a few dozen examples of the contributions that have been made to support that conviction. I know they exist. I would just like them in one place.

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Peder M Isager @isager.bsky.social · 26/06/2025

Just discovered "Mental health professionals’ attitudes towards the network theory of mental disorders" by @leahschumaker.bsky.social & Levente Kriston (osf.io/462cs). Fascinating read. Partly confirms suspicion I've had for a while that therapists see NTMD as "nothing new" (but see pub for details)

doi.org

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simine vazire @simine.com · 08/05/2025

My editorial on how journals can earn trust. We often use journal names as proxies for quality. This is bad bc it’s not valid. But it could be. Editors could make journal name a valid signal. And we could place value on journals that show us how they do that. journals.sagepub.com/doi/full/10....

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Sajedeh Rasti @sajedehra.bsky.social · 08/05/2025

There is still time to sign up for the last workshop of this academic year at PMGS, "Scientific Criticism and Peer Review," by @renebekkers.mastodon.social.ap.brid.gy Check out the details here: paulmeehlschool.github.io/workshops/cr...

paulmeehlschool.github.io

Scientific Criticism and Peer Review | Paul meehl Graduate School

June 6, 2025

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Melissa Kline Struhl @mekline.bsky.social · 09/04/2025

Psych-DS is (1) spellcheck for your datasets and (2) a pathway to standardizing data in our academic fields that *everyone* can learn. And it's live RIGHT NOW! psych-ds.github.io (This is the announcement post I've been leading up to)

psych-ds.github.io

Psych-DS

A specification for psychological datasets. JSON metadata, predictable directory structure, and machine-readable specifications for tabular datasets.

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Peder M Isager @isager.bsky.social · 03/04/2025

I'll finally get to teach a workshop on one of my favourite subjects - causal inference - at the Paul Meehl graduate school may 9th! Ever wondered what the point is of controlling for variables in your regression analysis? Come find out with us!

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Sajedeh Rasti @sajedehra.bsky.social · 02/04/2025

The new workshop of Paul Meehl Graduate School, Causal Inference and Variable Control by @isager.bsky.social, is open for registration. Check out the announcement below: paulmeehlschool.github.io/2025-04-02-c...

paulmeehlschool.github.io

New workshop announced: Causal Inference and Variable Control | Paul meehl Graduate School

We are excited to announce that registration is now open for the workshop “Causal Inference and Variable Control”. In this...

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Ian Hussey @ianhussey.mmmdata.io · 06/03/2025

Looking for a PhD/Postdoc in Switzerland? English speaking lab, good pay, incredible scenery. There's lots of funding calls for projects related to my work on the meta-science of measurement, error detection and trustworthiness assessment. Reach out if you're interested in writing a grant together.

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Peder M Isager @isager.bsky.social · 06/03/2025

From www.chronicle.com/article/soci... by Gelman and King. I applaud the idea presented in this piece, but this specific argument is flawed🧵

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Carlisle Rainey 👨‍💻📊📚 @carlislerainey.bsky.social · 26/02/2025

My commentary on Isager, van ‘t Veer, and Lakens’ (2024) “Replication value as a function of citation impact and sample size” is now accepted at Meta-Psychology. CC: @isager.bsky.social @lakens.bsky.social @annaveer.bsky.social Preprint: osf.io/preprints/me...

osf.io

OSF

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Akiyoshi Kitaoka @akiyoshikitaoka.bsky.social · 25/02/2025

The inset appears to move.

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Peder M Isager @isager.bsky.social · 13/02/2025

Inspiring work by @sajedehra.bsky.social et al. on identifying the various benefits of coordination in science, and providing a better language to talk about what coordination in science actually *is*. I personally long to one day be part of a truly coordinated research line.

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Sajedeh Rasti @sajedehra.bsky.social · 12/02/2025

Mark your calenders. The dates and topics of the upcoming workshops of the Paul Meehl Graduate School are announced. Stay tuned for more information paulmeehlschool.github.io/2025-02-10-s...

paulmeehlschool.github.io

Upcoming Workshops: Finalized Dates & Topics | Paul meehl Graduate School

We’re excited to share the dates for our upcoming workshops for the remainder of this academic year. Mark your calendars...

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Julia M. Rohrer @dingdingpeng.the100.ci · 22/01/2025

Go, shorty: New blog post! (How) should you interpret pre-post differences in a randomized study? In which we introduce a new format, "reviewer notes" -- points that occasionally need to be made during the peer-review process. www.the100.ci/2025/01/22/r...

the100.ci

Reviewer notes: In a randomized experiment, the pre-post differences are not effect estimates

Reviewer notes are a new short format with brief explanations of basic ideas that might come in handy during (for example) the peer-review process. They are a great way to keep Julia from writing 10,0...

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Jack Fitzgerald @jackfitzgerald.bsky.social · 20/12/2024

New paper for holiday reading! @isager.bsky.social and I provide an introduction to three-sided testing, a framework for testing estimates' practical significance. We offer a tutorial, Shiny app, + commands/code in #Rstats, #Jamovi, + #Stata. 1/9 osf.io/preprints/psyarxiv/8y925 #EconSky #PsychSky

In the inferiority region, a 95% confidence interval is used to assess whether the estimate is significantly bounded beneath the lower delta bound. In the inferiority region, a 90% confidence interval is used to assess whether the estimate is significantly bounded within the delta bounds, even if the 95% confidence interval crosses one of the delta bounds. In the superiority region, a 95% confidence interval is used to assess whether the estimate is significantly bounded above the upper delta bound. The bottom four estimates have confidence intervals crossing the delta bounds, implying that results are inconclusive.

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Peder M Isager @isager.bsky.social · 20/12/2024

New preprint: “Three-Sided Testing to Establish Practical Significance: A Tutorial” (osf.io/preprints/ps...) with @FitzgeraldJack_, proposing an upgraded version of the TOST equivalence test 🧵

osf.io

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Alejandro Fábregas-Tejeda @alejandrofabregastejeda.com · 02/12/2024

How do we judge whether a particular experiment is 'pursuitworthy'? What factors need to be considered? @ennofischer.bsky.social & I are receiving submissions exploring these & related questions for a topical collection in EJPS! Please help us spread the word! tu-dresden.de/gsw/phil/iph... #philsci

Promotional image announcing the call for papers for the topical collection "The Pursuitworthiness of Experiments Across the Sciences" to be published in the European Journal for Philosophy of Science (Guest Editors: Enno Fischer and Alejandro Fábregas-Tejeda). The call for papers runs from November 1, 2024 to April 20, 2025.

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Peder M Isager @isager.bsky.social · 13/08/2024

New blog post: Seven basic rules for causal inference: pedermisager.org/blog/seven_b..., in which I state the most basic ways that causal relationships can produce correlation, and provide R code to demonstrate how each rule plays out in data.

pedermisager.org

Seven basic rules for causal inference | Peder M. Isager

Personal website of Dr. Peder M. Isager

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Peder M Isager @isager.bsky.social · 30/07/2024

Ever had really great discussions during a hackathon and gone home thinking others could also benefit from the ideas bounced around? Inspired by @simine.com's garage analogy, we thought about how to coordinate scientific self-correction. See our ‘hackathon proceedings’ osf.io/preprints/me... 1/

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Gilad Feldman @giladfeldman.bsky.social · 28/07/2024

New preprint: "The value of replications goes beyond replicability and is tied to the value of the research it replicates: Commentary on Isager et al. (2024)" My very quick take on the Isager and team's work on value of replications. Read: www.researchgate.net/publication/...

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Peder M Isager @isager.bsky.social · 24/05/2024

Ever wanted to test both equivalence and superiority/inferiority? How about a four-sided test of significance (FOST)? In this blog post, I describe what a FOST is, when it might be useful, and I ask readers to help me assess if FOST makes sense: pedermisager.org/blog/four-on...

pedermisager.org

Four one-sided test of significance (FOST). Dear reader, does this make sense? | Peder M. Isager

Personal website of Dr. Peder M. Isager

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Farid Anvari @faridanvari.bsky.social · 16/04/2024

My wife has family in Gaza, brothers and sisters, nieces and nephews. I don’t need to tell you how bad things are, and they’re the lucky ones. We want to try to help get them out. Please, if you can, donate and/or share this gofundme link; no amount is too small. gofund.me/6356721f

gofund.me

Help my family evacuate from Gaza, organized by Jana Anvari

Hello kind people of the world, I am asking for your help in bringing my family to s… Jana Anvari needs your support for Help my family evacuate from Gaza

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Peder M Isager @isager.bsky.social · 18/03/2024

Interested in replication research? Consider writing a commentary for the next special issue in Meta-Psychology which will publish critiques of the article "Replication value as a function of citation impact and sample size": open.lnu.se/index.php/me...

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Anne Scheel @annemscheel.bsky.social · 09/03/2024

Anyone feeling qualified to review (psych) papers that use equivalence tests (i.e., review with a focus on the equivalence tests)? I get too many requests and don’t know who to recommend other than @lakens.bsky.social and @isager.bsky.social (who probably have the same problem)

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Peder M Isager @isager.bsky.social · 11/12/2023

@annaveer.bsky.social @lakens.bsky.social Thed van Leeuwen and I applied a method for quantifying "replication value" on a large sample of fMRI articles in social neuroscience, to see if the method is practically feasible. Open access version of our attempt is now online: doi.org/10.1016/j.co...

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Mark Rubin @markrubin.bsky.social · 02/12/2023

“Causal inference is not just a statistics problem” New article by @lucystats.bsky.social, @travisgerke.bsky.social, and @malcolmbarrett.malco.io in the Journal of Statistics and Data Science Education Open access: doi.org/10.1080/2693... #Stats #DataScience 🧪

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Daniel Lakens @lakens.bsky.social · 01/12/2023

New episode of @nulliusinverba.bsky.social on mentorship in academia. nulliusinverba.podbean.com/e/mentorship/ What are the characteristics of a good mentor-mentee relationship? We discuss some of our mentors, and how important they are for a career in science.

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simine vazire @simine.com · 01/12/2023

I'm thrilled to announce the new Psych Science editor team! We'll start on Jan 1, 2024. Check us out: here: www.psychologicalscience.org/public… We're spread across 15 countries in 5 continents! 🌍🌎🌏 Here’s a thread to introduce the team!

psychologicalscience.org

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