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Hans Fredrik Sunde

@hfsunde.bsky.social
623 followers 199 following 151 posts

Researcher at the Centre for Fertility and Health (NIPH) in Oslo. Interested in assortative mating, behavioral genetics, and bias in research. www.hansfredriksunde.com

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Reposted by Hans Fredrik Sunde
Julia M. Rohrer @dingdingpeng.the100.ci · 14/09/2026
Did you know that there’s only a single letter separating an “idionomic clinical workflow” from an “idiotnomic clinical workflow”? I haven’t managed to write my screed about cluster analysis yet, here’s another blog post in the meantime: www.the100.ci/2024/10/28/i...
the100.ci
Idiographic Approaches in Psychology: Hold your horses
There have been persistent calls spurring psychologists to do more “idiographic” research, starting even before Peter Molenaar’s “Manifesto on Psychology as Idiographic Science”, which is already 20 y...
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Reposted by Hans Fredrik Sunde
Michel Nivard @michelnivard.bsky.social · 02/09/2026
🚨& 🧵 Our new Nature paper is out! Across 46 cohorts and up to 1.14M people per Big Five trait, we do GWAS and ask how robust, generalizable and consequential the genetic signals underlying personality really are. www.nature.com/articles/s41...
nature.com
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Michael Okun @michael-okun.bsky.social · 10/06/2026
Over the last month I saw that human editors are now stripped of control. I could no longer stop the system from auto-inviting "reviewers" with zero relevant expertise. Even worse - the AI began actively revoking the invitations I manually sent out to actual, qualified experts.
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ESSGN @essgn.bsky.social · 15/04/2026
Are you mostly noise? This week Born and Raised went to talk to @eivindy.bsky.social about the genetics of personality, the "gloomy prospect", and about Eivind's possible weird mutation!
essgn.podbean.com
Are You Mostly Noise? Eivind Ystrøm on the Genetics of Personality | Born and Raised
Personality psychologists were doing behavior genetics way before it was cool. In this episode, Rafael and Aysu sit down with Eivind Ystrøm, personality psychologist at the University of Oslo, to talk...
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Reposted by Hans Fredrik Sunde
Max Planck Institute for Demographic Research (MPIDR) @mpidr.bsky.social · 16/04/2026
💔People with a similar risk of divorce are more likely to marry: Hans F. Sunde & Philipp Dierker found that spouses tend to be similar in terms of their risk of separation. Marriage is shaped not only by a person's own background, but also by that of their partner. www.demogr.mpg.de/go/divorce_risk
Illustration of two people standing in front of a large pair of open scissors, symbolizing a separation, accompanied by text about the Max Planck Institute’s study on the risk of divorce.
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Hans Fredrik Sunde @hfsunde.bsky.social · 13/04/2026
Nature recently published massive studies on the credibility of social science. We — the Norwegian co-authors on the robustness-paper, Gerit Pfuhl, @oysteinhernaes.bsky.social, @maxkorbmacher.bsky.social, and me — wrote an opinion piece about it (in Norwegian): www.forskersonen.no/forskning-kr...
forskersonen.no
Hva kjennetegner god vitenskap?
KRONIKK: Troverdig forskning er ikke forskning uten usikkerhet. Det er forskning som viser oss usikkerheten i stedet for å skjule den.
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Reposted by Hans Fredrik Sunde
Julia M. Rohrer @dingdingpeng.the100.ci · 12/04/2026
This is cool work on a methodological level, but I also really like how “assortative mating on liability to divorce” is essentially a six-word relationship drama.
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Hans Fredrik Sunde @hfsunde.bsky.social · 10/04/2026
Can we estimate assortative mating for outcomes shared by partners? Yes we can! In a new paper together with @philippdierker.bsky.social, I find that individuals with similar liabilities to divorce are more likely to get married in the first place!
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Brian Nosek @briannosek.bsky.social · 01/04/2026
SCORE, a collaboration of 865 researchers, is now released as three papers in Nature, six preprints, and a lot of data (cos.io/score/). SCORE examined repeatability of findings from the social-behavioral sciences and tested whether human and automated methods could predict replicability.
cos.io
SCORE | Center for Open Science
SCORE shows that there is no shortcut to producing credible research findings, and there is no single indicator of trustworthiness. Research progress depends on transparency, rigor, and establishing r...
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Hans Fredrik Sunde @hfsunde.bsky.social · 01/04/2026
Check out this French popular science article on partner similarity and assortative mating, featuring yours truly:
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Felix C Tropf @fctropf.bsky.social · 27/03/2026
Always energising to engage with cutting-edge work on assortative mating, cross-ancestry prediction, and rare variants at @ESSGN — especially with such a strong cohort of doctoral researchers at Vrije Universiteit Amsterdam. #Sociogenomics #GeneticPrediction #ESSGN
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Abdel Abdellaoui @dr-appie.bsky.social · 24/03/2026
Me & @aysuo.bsky.social are hiring a postdoc to study gene–environment interplay in health & social inequalities 🧬 You'll analyze genomic data as part of a collaboration with Uppsala & Oslo at @amsterdamumc.bsky.social (NL) werkenbij.amsterdamumc.org/en/vacatures... Please RT for karma points ♥️
werkenbij.amsterdamumc.org
Vacatures - Postdoctoral researcher specialising in gene–environment interplay - Amsterdam UMC
Ready to unravel the complex interplay between genes and environment shaping health and society? Join our interdisciplinary team analyzing large-scale genomic data across Europe. Are you eager to contribute to groundbreaking research on health and social inequalities?
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Reposted by Hans Fredrik Sunde
Giacomo Bignardi @giacomobignardi.bsky.social · 22/03/2026
Engaging and clear podcast from @hfsunde.bsky.social on what is assortative mating and why it matters 🎧
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Reposted by Hans Fredrik Sunde
Rafael Ahlskog @rafaelahlskog.bsky.social · 19/03/2026
Me and @aysuo.bsky.social went to Oslo a couple of weeks ago. This conversation with @hfsunde.bsky.social was really, really exciting!
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Hans Fredrik Sunde @hfsunde.bsky.social · 20/03/2026
I was on a podcast! I had great fun talking about my favorite social science genetics topic (partner similarity!) with @aysuo.bsky.social and @rafaelahlskog.bsky.social. If you want to learn more about assortative mating and why it is so interesting, give it a listen 🎧!
open.spotify.com
Are your genes picking your partner? Hans Fredrik Sunde on all things assortative mating
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Abdel Abdellaoui @dr-appie.bsky.social · 10/03/2026
If you're looking to build or deepen your knowledge in statistical genetics, the ISG Workshop (June 1–11) covers the full range: biometrics, GWAS, polygenic scores, causal inference, and more. Open to all levels, virtual, and international: www.colorado.edu/ibg/workshop... Retweets appreciated 🙏
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Julia M. Rohrer @dingdingpeng.the100.ci · 24/02/2026
There seem to be a whole (older) cohort of eminent social psychologists who essentially do not understand the concept of sampling error, and I wonder to what extent that lack of understanding was an adaptive trait for a career.
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Giacomo Bignardi @giacomobignardi.bsky.social · 19/02/2026
Follow up on the genetics of chills from art and poetry. This time, including chills from music too 🧵 ⬇️
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Eivind Ystrom @eivindy.bsky.social · 04/02/2026
Article alert!🚨 1/11 Parents matter - and we can quantify part of that influence genetically. Our new JCPP paper on multivariate indirect maternal genetic effects across internalizing and externalizing symptoms. doi.org/10.1111/jcpp... #jcpp @uio.no @unioslo-svfak.bsky.social @unioslo-uv.bsky.social
doi.org
<em>Journal of Child Psychology and Psychiatry</em> | ACAMH Pediatric Journal | Wiley Online Library
Background From a functionalist perspective, parenting behaviors have adaptive functions and are partly expressions of genetic variation. Maternal genes that have effects on children are often refer...
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Hans Fredrik Sunde @hfsunde.bsky.social · 08/01/2026
This very interesting project has finally been published. Congratulations! They find stronger genetic associations with place of residence than place of birth for many traits, showing that population stratification also involves active rGE. Read @iakuznetsov.bsky.social's thread here:
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Michel Nivard @michelnivard.bsky.social · 20/12/2025
I drafted a letter to the editor, please help me out by DMing, commenting, emailing feedback if you are an expert on colliderbias, id obviosuly ad you as a author, Ideally we submit within 24-48 hrs, draft: zenodo.org/records/1800... (click download if the pdf doesnt preview on zenodo)
zenodo.org
Negative Associations Between Early and Adult Performance Arise from Colider Selection Bias
Güllich et al. argue that among elite performers there is a negative associationbetween early and adult performance, a pattern they link to distinct developmentalcausal mechanisms for early, and adult...
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Reposted by Hans Fredrik Sunde
Abdel Abdellaoui @dr-appie.bsky.social · 20/12/2025
Welcome to my 2025 scientific publications wrapped! It's been a good year for behavioral genetics, with exciting studies on the relationship between our DNA and socio-economic outcomes, sexual behavior, personality, intelligence, and psychiatric disorders 🧬 See thread below 👇🏽
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Hans Fredrik Sunde @hfsunde.bsky.social · 18/12/2025
Since journal editors are still too lenient on excessive use of abbreviations, I found another use case for large language models:
A large language model (NotebookLM) prompted to give an overview of abbreviations used in a paper.
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Reposted by Hans Fredrik Sunde
Timo B. Roettger @timoroettger.bsky.social · 12/12/2025
Or as I often say: Friends don't let friends use abbreviations!
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Hans Fredrik Sunde @hfsunde.bsky.social · 10/12/2025
We have a new paper out on personality and mate preferences. Check it out:
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Eivind Ystrom @eivindy.bsky.social · 10/12/2025
1/11 New @biorxivpreprint.bsky.social led by @ESSGNetwork PhD student @qiyuanpeng.bsky.social : Parental influence on children’s educational achievement using Trio-GCTA. doi.org/10.64898/202...
doi.org
Parental Influence on Children’s Educational Achievements: Analysing Direct and Indirect Genetic Effects through Trio-GCTA
Educational achievement is a key predictor of later-life outcomes, including financial security, social mobility, health, and mortality. Knowing its familial determinants, such as genetic predispositi...
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Reposted by Hans Fredrik Sunde
Fartein Ask Torvik @torvik.bsky.social · 05/12/2025
Who wants to join us in Oslo to study how health influences educational underperformance? We are hiring PhDs postdocs candidates for our funded project. We will follow children from birth to emerging adulthood, using behavioural genetic methods and large datasets 945000.webcruiter.no/Main/Recruit...
945000.webcruiter.no
Two positions as either PhD or postdoctoral fellow on health determinants of education
Do you want to research how health influences school performance and leads to intergenerational inequality? We have two vacant 3-year positions as a PhD fellow or postdoctoral research fellow in the p...
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Michel Nivard @michelnivard.bsky.social · 04/12/2025
Its notable that some (in this case @mendelrandom.bsky.social (George Davey-Smith)) were on to him while he was alive, video a young GDS confronting Eysenk in a Q&A in 1994 for his data being inconsistent: youtu.be/K9pyS7EGCV8?...
youtu.be
Hans Eysenck (1994) personality and cancer lecture
YouTube video by Philip Corr
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Torkild Hovde Lyngstad @torkildl.bsky.social · 30/11/2025
Det er det samme i Norge. Finansieringsmodellen belønner studentens progresjon (studiepoeng, grader) og straffer de som stryker studenter. Studentenes rettsikkerhet er svært sterk, og innbyr til klaging m.v. Universitetene bør befris fra dette, og gjøres mer uavhengige!
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Dan Quintana @dsquintana.bsky.social · 28/11/2025
If a lecturer wheels in an overhead projector with transparent sheets and markers, you’re about to witness either the best or worst lecture of your life. Nothing in between.
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Maria L. Andersen @mlandersen.com · 20/11/2025
New preprint📈📉 What happens to health and work when people become grandparents? Using Norwegian register data on all individuals born 1950-1960, we use event-study models comparing grandparents to not-yet grandparents to track changes in health and labour supply. 🔗 www.ssrn.com/abstract=571...
Figure showing event-study plots centred around the birth of one's first grandchild. The left plot shows health changes, the right shows labour market changes (separated by grandparent gender). The image shows the following abstract: 

The Cost of Caring: Gendered Health and Labour Market Effects of Grandparenthood

While the effects of the transition to parenthood are well-researched, less is known about how the transition to grandparenthood affects health and labour market outcomes. Using comprehensive Norwegian register data covering the entire population born between 1950 and 1960, we examine the effects of first-born grandchildren born during 2007–2018. Employing event-study models with person-year records, we compare grandparents to not-yet grandparents. Our findings reveal a sharp increase in the likelihood of respiratory infections during the first two years of grandparenthood, with infections increasing by 56% for women and 31% for men. Additionally, grandparenthood modestly reduces the likelihood of doctor’s visits related to mental disorders (4.5%) and cardiovascular health (3.3%). Grandmothers also see a decline in musculoskeletal-related visits (3.8%). These health-related changes coincide with notable gendered effects on labour market participation. Ten years after the birth of their first grandchild, employed women are 12% less likely to hold full-time positions compared to a 2% reduction for men. Overall, our findings demonstrate that the transition to grandparenthood significantly reshapes health and economic outcomes for both women and men. The larger effects observed for women likely reflect their greater involvement in informal childcare provision. Our results underscore the intersection of health, family dynamics, and gendered labour market behaviours in late adulthood.
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Oskar Pettersson @oskarpettersson.bsky.social · 21/11/2025
Cross-country analyses of EA PGI associations are a crucial step towards an increased understanding of how genetic influences occur in conjunction with societal structures - but also of the inevitable challenges that come with doing so. See this new study out in Molecular Psychiatry! ⬇️
nature.com
Within- and between-family genetic effects on educational achievement vary across countries and ages - Molecular Psychiatry
Molecular Psychiatry - Within- and between-family genetic effects on educational achievement vary across countries and ages
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Hans Fredrik Sunde @hfsunde.bsky.social · 20/11/2025
Getting grandchildren increases risk of respiratory infections, but also *reduces* risk of cardiovascular, musculoskeletal, and psychiatric conditions. It also causes a (probably voluntary) reduction in employment and income, an effect that is larger for women (i.e., a gendered "grandchild penalty")
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Hans Fredrik Sunde @hfsunde.bsky.social · 12/11/2025
👀
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Reposted by Hans Fredrik Sunde
Mark A. Hanson @hansonmark.bsky.social · 11/11/2025
We wrote the Strain on scientific publishing to highlight the problems of time & trust. With a fantastic group of co-authors, we present The Drain of Scientific Publishing: a 🧵 1/n Drain: arxiv.org/abs/2511.04820 Strain: direct.mit.edu/qss/article/... Oligopoly: direct.mit.edu/qss/article/...
A table showing profit margins of major publishers. A snippet of text related to this table is below.

1. The four-fold drain
1.1 Money
Currently, academic publishing is dominated by profit-oriented, multinational companies for
whom scientific knowledge is a commodity to be sold back to the academic community who
created it. The dominant four are Elsevier, Springer Nature, Wiley and Taylor & Francis,
which collectively generated over US$7.1 billion in revenue from journal publishing in 2024
alone, and over US$12 billion in profits between 2019 and 2024 (Table 1A). Their profit
margins have always been over 30% in the last five years, and for the largest publisher
(Elsevier) always over 37%.
Against many comparators, across many sectors, scientific publishing is one of the most
consistently profitable industries (Table S1). These financial arrangements make a substantial
difference to science budgets. In 2024, 46% of Elsevier revenues and 53% of Taylor &
Francis revenues were generated in North America, meaning that North American
researchers were charged over US$2.27 billion by just two for-profit publishers. The
Canadian research councils and the US National Science Foundation were allocated US$9.3
billion in that year.A figure detailing the drain on researcher time.

1. The four-fold drain

1.2 Time
The number of papers published each year is growing faster than the scientific workforce,
with the number of papers per researcher almost doubling between 1996 and 2022 (Figure
1A). This reflects the fact that publishers’ commercial desire to publish (sell) more material
has aligned well with the competitive prestige culture in which publications help secure jobs,
grants, promotions, and awards. To the extent that this growth is driven by a pressure for
profit, rather than scholarly imperatives, it distorts the way researchers spend their time.
The publishing system depends on unpaid reviewer labour, estimated to be over 130 million
unpaid hours annually in 2020 alone (9). Researchers have complained about the demands of
peer-review for decades, but the scale of the problem is now worse, with editors reporting
widespread difficulties recruiting reviewers. The growth in publications involves not only the
authors’ time, but that of academic editors and reviewers who are dealing with so many
review demands.
Even more seriously, the imperative to produce ever more articles reshapes the nature of
scientific inquiry. Evidence across multiple fields shows that more papers result in
‘ossification’, not new ideas (10). It may seem paradoxical that more papers can slow
progress until one considers how it affects researchers’ time. While rewards remain tied to
volume, prestige, and impact of publications, researchers will be nudged away from riskier,
local, interdisciplinary, and long-term work. The result is a treadmill of constant activity with
limited progress whereas core scholarly practices – such as reading, reflecting and engaging
with others’ contributions – is de-prioritized. What looks like productivity often masks
intellectual exhaustion built on a demoralizing, narrowing scientific vision.A table of profit margins across industries. The section of text related to this table is below:

1. The four-fold drain
1.1 Money
Currently, academic publishing is dominated by profit-oriented, multinational companies for
whom scientific knowledge is a commodity to be sold back to the academic community who
created it. The dominant four are Elsevier, Springer Nature, Wiley and Taylor & Francis,
which collectively generated over US$7.1 billion in revenue from journal publishing in 2024
alone, and over US$12 billion in profits between 2019 and 2024 (Table 1A). Their profit
margins have always been over 30% in the last five years, and for the largest publisher
(Elsevier) always over 37%.
Against many comparators, across many sectors, scientific publishing is one of the most
consistently profitable industries (Table S1). These financial arrangements make a substantial
difference to science budgets. In 2024, 46% of Elsevier revenues and 53% of Taylor &
Francis revenues were generated in North America, meaning that North American
researchers were charged over US$2.27 billion by just two for-profit publishers. The
Canadian research councils and the US National Science Foundation were allocated US$9.3
billion in that year.The costs of inaction are plain: wasted public funds, lost researcher time, compromised
scientific integrity and eroded public trust. Today, the system rewards commercial publishers
first, and science second. Without bold action from the funders we risk continuing to pour
resources into a system that prioritizes profit over the advancement of scientific knowledge.
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Brian Nosek @briannosek.bsky.social · 06/11/2025
Ouch
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Rosa Cheesman @rosacheesman.bsky.social · 04/11/2025
1/ 🚨New paper in Nature Genetics Genetic factors are associated with the educational fields people study, from arts to engineering. Article: www.nature.com/articles/s41... FAQ: www.thehastingscenter.org/genomic-find...
nature.com
Genetic associations with educational fields - Nature Genetics
Genome-wide analyses of 10 educational fields identify 17 associated loci. Analysis of genetic clustering across specializations identifies two key dimensions that show genetic overlap with personalit...
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Hans Fredrik Sunde @hfsunde.bsky.social · 29/10/2025
Better schools can compensate for dispositions
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Ludvig Daae Bjørndal @ludvigdb.bsky.social · 16/10/2025
Excited to share this work led by @cktamnes.bsky.social (and featuring many colleagues from PROMENTA at @unioslo-svfak.bsky.social) exploring the links between psychological wellbeing and illbeing across biological, developmental, societal and intervention perspectives
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Hans Fredrik Sunde @hfsunde.bsky.social · 14/10/2025
Very cool!
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Julia M. Rohrer @dingdingpeng.the100.ci · 13/10/2025
New blog post! Let's say you have two measures meant to capture the same confounder. They're highly correlated. Can you still proceed with your regression analysis? (I admit, the title is a bit of a spoiler) www.the100.ci/2025/10/13/i...
the100.ci
If you have two measures of the same confounder, you can just include both of them in your regression model
Sometimes, researchers worry about multicollinearity in situations where it’s actually a non-issue. Here’s one such scenario. Imagine a situation where you are interested in the effect of X on Y (X...
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Eivind Ystrom @eivindy.bsky.social · 05/10/2025
Two birds of a gene - catch Matt Keller's webinar at @uio.no on October 15th. Please share www.sv.uio.no/promenta/eng... @ispg.bsky.social @behaviorgenetic.bsky.social @unioslo-svfak.bsky.social @essgn.bsky.social @ibg.colorado.edu
sv.uio.no
Using structural equation models to estimate direct and indirect genetic effects and assortative mating in trio data - PROMENTA
Guest lecture by Matt Keller
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Chelsea Parlett @chelseaparlett.bsky.social · 04/10/2025
It’s not the method that makes you causal it’s the assumptions
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Hans Fredrik Sunde @hfsunde.bsky.social · 01/10/2025
PsyPost did a piece on our recent study on assortative mating. Check out the full paper here: www.nature.com/articles/s41...
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Ruben C. Arslan @ruben.the100.ci · 29/09/2025
Our fragmentation paper is now finally out! I put some of the dumb quips that didn't make the cut in the alt texts. journals.sagepub.com/doi/10.1177/...
A fragmented field. If we conceive of the constructs and concepts studied in behavioral science as a map, we would find that it is highly fragmented and directions are hard to come by. Scientists can hardly stand on each others' shoulders if they cannot manage to meet on common ground.Fragmentation has worsened, not decreased, as the field has grown. Partly, this happens because we have too many reverse Columbuses, who, in search of prestige, set out to find a new continent, but just end up renaming India. But partly, we face a real, solvable search problem when trying to connect our fuzzy constructs and flexible measures. Most measures are used only once. To be clear, we do not want to prevent or reduce refinements of existing constructs and measures. Revisions, translations, and other refinements can contribute to a more coherent, organized literature and improve measurement. We are most concerned with the measures conceived with limited planning and released into the literature without much commitment or much of a life expectancy. In ontologies, these are sometimes referred to as “orphan nodes.”
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Robin Hofmeister @rjhfmstr.bsky.social · 26/09/2025
🚨 New preprint out! We reconstructed parental haplotypes in >440k individuals (UK & Estonian biobanks) to estimate assortative mating directly in the parental generation. This reveals intensified assortment in recent generations. www.biorxiv.org/content/10.1...
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Abdel Abdellaoui @dr-appie.bsky.social · 16/09/2025
The largest study on late life virginity, based on >400k individuals, out now in @pnas.org Open access link: pnas.org/doi/10.1073/... Shoutout to shared first author @laurawesseldijk.bsky.social ❤️ Thread below 👇🏽
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Hans Fredrik Sunde @hfsunde.bsky.social · 10/09/2025
I tried making a figure explaining how the sum of variances law can be understood as the diagonal of a bivariate normal, and how a correlation between the two antecedent variables — such as under assortative mating — will result in greater variance and more cases above a threshold.
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Hans Fredrik Sunde @hfsunde.bsky.social · 11/06/2025
First, it is important to note that “assortative mating” is not synonymous with “partner similarity”. Instead, assortment is only one of several processes that can lead to partner similarity, the others being convergence, stratification, and inbreeding.
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Thomas H. Kleppestø @thomaskleppesto.bsky.social · 07/08/2025
We have a new paper out, led by the great @hfsunde.bsky.social! We find that the correlation between parental income and offspring mental disorders may be partly causal in adolescence (phenotypic transmission), but that it is largely explained by passive genetic transmission in adulthood.
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