Peder M Isager

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

@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....

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/

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.

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...

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.

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

🚨 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

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

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).

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!

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!

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.

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.

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)

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....