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Hans Fredrik Sunde

@hfsunde.bsky.social
624 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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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
Here is the link to the study: doi.org/10.1017/thg....
doi.org
Are Spouses Similar in Divorce? Investigating Spousal Similarity in Couple-Shared Outcomes | Twin Research and Human Genetics | Cambridge Core
Are Spouses Similar in Divorce? Investigating Spousal Similarity in Couple-Shared Outcomes
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Hans Fredrik Sunde @hfsunde.bsky.social · 10/04/2026
Finally, we hope similar models or lines of thinking can be applied to other couple-shared outcomes, such as fertility outcomes or joint health behaviors, to separate sex-specific sources of variation and account for their correlation.
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Hans Fredrik Sunde @hfsunde.bsky.social · 10/04/2026
To conclude, we found: - Partners are similar in their liability to divorce - Accounting for this reduces estimates of individual-level effects - Partner similarity itself increases variation in couples' divorce liability - Female factors were more important than male factors
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Hans Fredrik Sunde @hfsunde.bsky.social · 10/04/2026
We also found, regardless of specification, that female familial factors were more important than male familial factors (18% versus 10% variance explained, respectively).
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Hans Fredrik Sunde @hfsunde.bsky.social · 10/04/2026
The specific decomposition into additive and non-additive genetic components (or shared-environmental components) are sensitive to assumptions about type and history of assortative mating, but the overall contribution of familial factors remained stable.
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Hans Fredrik Sunde @hfsunde.bsky.social · 10/04/2026
A substantial portion of variance (16%) in couple's divorce liability could be attributed to the correlation between male and female liabilities. If partners mated randomly, the divorce rate would drop by 8% (all else equal obviously!).
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Hans Fredrik Sunde @hfsunde.bsky.social · 10/04/2026
We find that familial factors (e.g., additive heritability) are estimated to be higher in the classic twin model compared to the extended twin model.
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Hans Fredrik Sunde @hfsunde.bsky.social · 10/04/2026
We therefore estimate a classic twin model that treats divorce as an individual-level outcome, along with an extended twin model that accounts for assortative mating and treats divorce as a couple-shared outcome.
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Hans Fredrik Sunde @hfsunde.bsky.social · 10/04/2026
One motivation for the study was to show how traditional behavioral genetic methods that have treated divorce as an individual-level outcome may have overestimated the effects of family history because they do not account for the effect of the (correlated) spouse.
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Hans Fredrik Sunde @hfsunde.bsky.social · 10/04/2026
We also find that sisters are more highly correlated than brothers (.18 vs .14, respectively), which implies that female familial factors are slightly more important for a couple's divorce risk than the male familial factors.
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Hans Fredrik Sunde @hfsunde.bsky.social · 10/04/2026
The high estimated correlation is not surprising. The affine correlations are very high relative to the sibling correlations, implying that partners must be very similar too.
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Hans Fredrik Sunde @hfsunde.bsky.social · 10/04/2026
The correlations between affines provide sufficient information to estimate the implied correlation between the two spouses' familial liabilites. We find that partners are highly correlated for liability to divorce (r = .60).
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Hans Fredrik Sunde @hfsunde.bsky.social · 10/04/2026
Even individuals who are socially very distant are correlated for divorce. The tetrachoric correlation between one marriage and the husband's brothers' wife's sister's husband's brother's marriage was about .04.
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Hans Fredrik Sunde @hfsunde.bsky.social · 10/04/2026
And we find that even distant affines (another word for in-laws) are correlated. And while the correlations between affines are not large (~.06), they are relatively large compared to siblings (~.15).
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Hans Fredrik Sunde @hfsunde.bsky.social · 10/04/2026
How can we estimate correlations between partners for an outcome that they share? One solution is to chain-link pairs of spouses and siblings into extended family units. This allows us to quantify similarity between in-laws (and in-laws of in-laws), indirectly quantifying partner similarity.
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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 · 02/04/2026
Check email :)
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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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Hans Fredrik Sunde @hfsunde.bsky.social · 23/03/2026
While this is amazing, I do think people may underestimate the work going into writing good and precise prompts (although major hack: Making codex write the prompt...)
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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 · 29/01/2026
Adobe's version is alright: www.adobe.com/express/feat...
adobe.com
Free Online QR Code Generator | Adobe Express
Create a free QR code quickly and easily with the Adobe Express QR code maker. Generate a quality, customized QR code that links to your site in seconds.
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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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Hans Fredrik Sunde @hfsunde.bsky.social · 06/01/2026
When talking about assortment and its genetic consequences for offspring you are necessarily talking about the dyadic mother-father similarity. Whether other people are involved is not relevant. As such, the framework still holds for non-monogamy, and does not make any claim on what is natural.
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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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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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Hans Fredrik Sunde @hfsunde.bsky.social · 18/12/2025
One possible use case is to demonstrate that ripping a phone book in two is not about muscles but all about technique. I thought it was an outdated skill!
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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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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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Hans Fredrik Sunde @hfsunde.bsky.social · 29/11/2025
Depends on the context I guess. For example for temperature, brighter would be "more".
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