Zimbo Boudewijns
@zimboboudewijns.bsky.social
Data Steward at Utrecht University
Reposted by Zimbo Boudewijns
A recent study purports to have found that multilingualism protects against accelerated ageing. I've taken a closer look at it, and it doesn't look good.
New blog post: "Does multilingualism really protect against accelerated ageing? Some critical comments"
janhove.github.io/posts/2025-1...
New blog post: "Does multilingualism really protect against accelerated ageing? Some critical comments"
janhove.github.io/posts/2025-1...
December 15, 2025 at 5:07 PM
A recent study purports to have found that multilingualism protects against accelerated ageing. I've taken a closer look at it, and it doesn't look good.
New blog post: "Does multilingualism really protect against accelerated ageing? Some critical comments"
janhove.github.io/posts/2025-1...
New blog post: "Does multilingualism really protect against accelerated ageing? Some critical comments"
janhove.github.io/posts/2025-1...
Reposted by Zimbo Boudewijns
Our guidance regarding performance measures for medical AI models is finally out!
- Stop bashing AUROC, although it does not settle things
- Calibration and clinical utility are key
- Show risk distributions
- Classification statistics (e.g. F1) are improper
www.thelancet.com/journals/lan...
- Stop bashing AUROC, although it does not settle things
- Calibration and clinical utility are key
- Show risk distributions
- Classification statistics (e.g. F1) are improper
www.thelancet.com/journals/lan...
Evaluation of performance measures in predictive artificial intelligence models to support medical decisions: overview and guidance
Numerous measures have been proposed to illustrate the performance of predictive artificial
intelligence (AI) models. Selecting appropriate performance measures is essential
for predictive AI models i...
www.thelancet.com
December 13, 2025 at 2:04 PM
Our guidance regarding performance measures for medical AI models is finally out!
- Stop bashing AUROC, although it does not settle things
- Calibration and clinical utility are key
- Show risk distributions
- Classification statistics (e.g. F1) are improper
www.thelancet.com/journals/lan...
- Stop bashing AUROC, although it does not settle things
- Calibration and clinical utility are key
- Show risk distributions
- Classification statistics (e.g. F1) are improper
www.thelancet.com/journals/lan...
Reposted by Zimbo Boudewijns
Bluesky bestaat uit aardige mensen, dus:
Het gezin van één van onze kinderen vertrekt voor onbepaalde tijd naar Spanje en ze verhuren hun woning (woon/keuken/twee sl.kamers/ tuintje/berging) in centrum Zaandam voor € 1250 excl. g/w/l. Minstens 3 mnd maar in overleg ook langer.
Stuur direct message.
Het gezin van één van onze kinderen vertrekt voor onbepaalde tijd naar Spanje en ze verhuren hun woning (woon/keuken/twee sl.kamers/ tuintje/berging) in centrum Zaandam voor € 1250 excl. g/w/l. Minstens 3 mnd maar in overleg ook langer.
Stuur direct message.
December 10, 2025 at 10:57 AM
Bluesky bestaat uit aardige mensen, dus:
Het gezin van één van onze kinderen vertrekt voor onbepaalde tijd naar Spanje en ze verhuren hun woning (woon/keuken/twee sl.kamers/ tuintje/berging) in centrum Zaandam voor € 1250 excl. g/w/l. Minstens 3 mnd maar in overleg ook langer.
Stuur direct message.
Het gezin van één van onze kinderen vertrekt voor onbepaalde tijd naar Spanje en ze verhuren hun woning (woon/keuken/twee sl.kamers/ tuintje/berging) in centrum Zaandam voor € 1250 excl. g/w/l. Minstens 3 mnd maar in overleg ook langer.
Stuur direct message.
Reposted by Zimbo Boudewijns
Vanuit een “One Health” perspectief geeft hoog-pathogene vogelgriep momenteel grote zorgen op drie gebieden: 1. Bij wilde dieren: die zorg is bewaarheid, met sterfte van duizenden kraanvogels in West-Europa in Duitsland, Frankrijk en Spanje in de afgelopen weken. www.natuurpunt.be/nieuws/vogel...
Vogelgriep teistert kraanvogelpopulatie
www.natuurpunt.be
December 5, 2025 at 9:37 PM
Vanuit een “One Health” perspectief geeft hoog-pathogene vogelgriep momenteel grote zorgen op drie gebieden: 1. Bij wilde dieren: die zorg is bewaarheid, met sterfte van duizenden kraanvogels in West-Europa in Duitsland, Frankrijk en Spanje in de afgelopen weken. www.natuurpunt.be/nieuws/vogel...
Reposted by Zimbo Boudewijns
1. Transparency is necessary for credibility
2. Transparency is hard to change
3. Require transparency*
4. Transparency is not magic
5. Journals are part of problem
6. Expect more from journals
7. Peer review is not magic
8. A crisis can look a lot like „normal“ science
9. Meta-analysis is not magic
2. Transparency is hard to change
3. Require transparency*
4. Transparency is not magic
5. Journals are part of problem
6. Expect more from journals
7. Peer review is not magic
8. A crisis can look a lot like „normal“ science
9. Meta-analysis is not magic
In case you have missed Simine Vazire's excellent webinar yesterday, here is the link to watch it online: youtu.be/_vb1CNwC3CM Thanks again @simine.com for staying up so late and thanks to the audience for the great questions!
PCI Webinar series #13 - Simine Vazire - Recognizing and responding to a replication crisis
youtu.be
December 3, 2025 at 9:40 AM
1. Transparency is necessary for credibility
2. Transparency is hard to change
3. Require transparency*
4. Transparency is not magic
5. Journals are part of problem
6. Expect more from journals
7. Peer review is not magic
8. A crisis can look a lot like „normal“ science
9. Meta-analysis is not magic
2. Transparency is hard to change
3. Require transparency*
4. Transparency is not magic
5. Journals are part of problem
6. Expect more from journals
7. Peer review is not magic
8. A crisis can look a lot like „normal“ science
9. Meta-analysis is not magic
Reposted by Zimbo Boudewijns
If you'd like to learn more about how OpenSAFELY works - and how we solved the privacy and efficiency challenges, to make national GP data securely accessible - here's a 5 minute video!
www.youtube.com/watch?v=GRjR...
www.youtube.com/watch?v=GRjR...
OpenSAFELY in a nutshell
YouTube video by Bennett Institute for Applied Data Science
www.youtube.com
November 26, 2025 at 7:09 PM
If you'd like to learn more about how OpenSAFELY works - and how we solved the privacy and efficiency challenges, to make national GP data securely accessible - here's a 5 minute video!
www.youtube.com/watch?v=GRjR...
www.youtube.com/watch?v=GRjR...
Reposted by Zimbo Boudewijns
The link between the gut #microbiome and autism is not backed by science, researchers say.
Read the full opinion piece in @cp-neuron.bsky.social: spkl.io/63322AbxpA
@wiringthebrain.bsky.social, @statsepi.bsky.social, & @deevybee.bsky.social
Read the full opinion piece in @cp-neuron.bsky.social: spkl.io/63322AbxpA
@wiringthebrain.bsky.social, @statsepi.bsky.social, & @deevybee.bsky.social
November 13, 2025 at 4:00 PM
The link between the gut #microbiome and autism is not backed by science, researchers say.
Read the full opinion piece in @cp-neuron.bsky.social: spkl.io/63322AbxpA
@wiringthebrain.bsky.social, @statsepi.bsky.social, & @deevybee.bsky.social
Read the full opinion piece in @cp-neuron.bsky.social: spkl.io/63322AbxpA
@wiringthebrain.bsky.social, @statsepi.bsky.social, & @deevybee.bsky.social
Reposted by Zimbo Boudewijns
opencausal.org is online!
Open Causal is an open platform to share, discuss and reuse causal graphs. Join now as a beta user, help shaping the future of causal graphs!
Open Causal is an open platform to share, discuss and reuse causal graphs. Join now as a beta user, help shaping the future of causal graphs!
Open Causal (Beta)
opencausal.org
November 13, 2025 at 6:59 AM
opencausal.org is online!
Open Causal is an open platform to share, discuss and reuse causal graphs. Join now as a beta user, help shaping the future of causal graphs!
Open Causal is an open platform to share, discuss and reuse causal graphs. Join now as a beta user, help shaping the future of causal graphs!
Reposted by Zimbo Boudewijns
Vandaag staat mijn visie als hypothetische minister van Landbouw, Natuur, en Stikstof in dit prachtige artikel in @volkskrant.nl
Dat stuk is natuurlijk erg kort en simpel, daarom hier een 🧵 van mijn hoofdpunten met wat meer onderbouwing!
www.volkskrant.nl/kijkverder/v...
Dat stuk is natuurlijk erg kort en simpel, daarom hier een 🧵 van mijn hoofdpunten met wat meer onderbouwing!
www.volkskrant.nl/kijkverder/v...
Analyse Wonen, stikstof, migratie: deze wetenschappers weten wél hoe je dat oplost
Hoe zouden wetenschappelijke experts omgaan met de vele uitdagingen waarvoor Nederland staat? De uitkomsten zijn opvallend eenduidig – en hoopgevend.
www.volkskrant.nl
September 27, 2025 at 4:56 PM
Vandaag staat mijn visie als hypothetische minister van Landbouw, Natuur, en Stikstof in dit prachtige artikel in @volkskrant.nl
Dat stuk is natuurlijk erg kort en simpel, daarom hier een 🧵 van mijn hoofdpunten met wat meer onderbouwing!
www.volkskrant.nl/kijkverder/v...
Dat stuk is natuurlijk erg kort en simpel, daarom hier een 🧵 van mijn hoofdpunten met wat meer onderbouwing!
www.volkskrant.nl/kijkverder/v...
Reposted by Zimbo Boudewijns
Gisteren was ik bij de prachtige en actuele Herzberglezing van @sheilas.bsky.social. Neem er even de tijd voor …
www.trouw.nl/verdieping/m...
www.trouw.nl/verdieping/m...
Mag je de democratie verdedigen met niet-democratische middelen, en zo ja, waar vecht je dan nog voor?
Abel Herzberg heeft indringend geschreven over de rollen die mensen aannemen onder de extreemste omstandigheden. Van toen naar nu is een grote sprong in de tijd, en tegelijk helemaal niet zo groot.
www.trouw.nl
September 22, 2025 at 7:21 AM
Gisteren was ik bij de prachtige en actuele Herzberglezing van @sheilas.bsky.social. Neem er even de tijd voor …
www.trouw.nl/verdieping/m...
www.trouw.nl/verdieping/m...
Reposted by Zimbo Boudewijns
Apply to do a PhD with me, Laura Corbin, Gareth Hawkes and George Davey Smith ( @mendelrandom.bsky.social) in Bristol on identifying rare effects on health using new and innovative methods. Amazing team, great educational environment, lovely city. Forward to your undergrads wrapping up!
Shining a light on the un-common to identify novel health risk-factors - GW4 BioMed MRC DTP
Project Code MRCPHS26Br Nivard Project Type Dry lab Research Theme Population Health Science Project Summary Download Summary Complex traits such as body mass index and height are influenced by a mixt...
gw4biomed.ac.uk
September 19, 2025 at 7:46 AM
Apply to do a PhD with me, Laura Corbin, Gareth Hawkes and George Davey Smith ( @mendelrandom.bsky.social) in Bristol on identifying rare effects on health using new and innovative methods. Amazing team, great educational environment, lovely city. Forward to your undergrads wrapping up!
Reposted by Zimbo Boudewijns
Great piece today by Simon Barnes, one of last to see a Slender-billed Curlew observer.co.uk/news/science... following research confirming extinction @rspb.bsky.social @rspbscience.bsky.social @birdlifeglobal.bsky.social @naturalis.bsky.social @nhm-london.bsky.social @ucllifesciences.bsky.social
Why we should all mourn the slender-billed curlew
A bird that hasn’t been photographed since 1995 has now been declared extinct. Its fate is cause for wider alarm
observer.co.uk
September 7, 2025 at 8:47 AM
Great piece today by Simon Barnes, one of last to see a Slender-billed Curlew observer.co.uk/news/science... following research confirming extinction @rspb.bsky.social @rspbscience.bsky.social @birdlifeglobal.bsky.social @naturalis.bsky.social @nhm-london.bsky.social @ucllifesciences.bsky.social
Reposted by Zimbo Boudewijns
Finished WARN-D data collection, all cohorts/waves. Cleaning & deidentifying data now so we can share w research community.
First look at compliance rates: left 3mo EMA data, right baseline + follow-ups. Super happy with this.
Thx to @rayyantutunji.bsky.social for quick graphs.
First look at compliance rates: left 3mo EMA data, right baseline + follow-ups. Super happy with this.
Thx to @rayyantutunji.bsky.social for quick graphs.
September 5, 2025 at 12:00 PM
Finished WARN-D data collection, all cohorts/waves. Cleaning & deidentifying data now so we can share w research community.
First look at compliance rates: left 3mo EMA data, right baseline + follow-ups. Super happy with this.
Thx to @rayyantutunji.bsky.social for quick graphs.
First look at compliance rates: left 3mo EMA data, right baseline + follow-ups. Super happy with this.
Thx to @rayyantutunji.bsky.social for quick graphs.
Reposted by Zimbo Boudewijns
I've been talking about basic DM practices like better documentation, good record keeping, spending time planning, and standardizing practices for a long time (and others talked about it long before me).
But these things still aren't happening in many projects. So I'll keep getting the word out. 😊📣
But these things still aren't happening in many projects. So I'll keep getting the word out. 😊📣
August 20, 2025 at 2:20 PM
I've been talking about basic DM practices like better documentation, good record keeping, spending time planning, and standardizing practices for a long time (and others talked about it long before me).
But these things still aren't happening in many projects. So I'll keep getting the word out. 😊📣
But these things still aren't happening in many projects. So I'll keep getting the word out. 😊📣
Reposted by Zimbo Boudewijns
We have 3 months open text data for N=2000 in which we ask 4/day what they are doing & some other questions (eg worst/best events of day).
Want to de-identify data before sharing.
1. How?
2. Anyone interested in collaborating? Surveys in Dutch/English, perhaps interesting paper for someone?
Want to de-identify data before sharing.
1. How?
2. Anyone interested in collaborating? Surveys in Dutch/English, perhaps interesting paper for someone?
August 18, 2025 at 1:59 PM
We have 3 months open text data for N=2000 in which we ask 4/day what they are doing & some other questions (eg worst/best events of day).
Want to de-identify data before sharing.
1. How?
2. Anyone interested in collaborating? Surveys in Dutch/English, perhaps interesting paper for someone?
Want to de-identify data before sharing.
1. How?
2. Anyone interested in collaborating? Surveys in Dutch/English, perhaps interesting paper for someone?
Reposted by Zimbo Boudewijns
New paper by @bsiepe.bsky.social & WARN-D team out now in JoPACS, on the (lack of) relation between EMA selfreport and Garmin passive data.
Guardian @theguardian.com coverage:
www.theguardian.com/technology/2...
Paper:
psycnet.apa.org/doiLanding?d...
🧪 #PsychSciSky #StatsSky #EpiSky
Guardian @theguardian.com coverage:
www.theguardian.com/technology/2...
Paper:
psycnet.apa.org/doiLanding?d...
🧪 #PsychSciSky #StatsSky #EpiSky
Smartwatches offer little insight into stress levels, researchers find
Academic study suggests devices cannot differentiate between someone being overworked and being excited
www.theguardian.com
August 11, 2025 at 10:51 AM
New paper by @bsiepe.bsky.social & WARN-D team out now in JoPACS, on the (lack of) relation between EMA selfreport and Garmin passive data.
Guardian @theguardian.com coverage:
www.theguardian.com/technology/2...
Paper:
psycnet.apa.org/doiLanding?d...
🧪 #PsychSciSky #StatsSky #EpiSky
Guardian @theguardian.com coverage:
www.theguardian.com/technology/2...
Paper:
psycnet.apa.org/doiLanding?d...
🧪 #PsychSciSky #StatsSky #EpiSky
Reposted by Zimbo Boudewijns
⚠️ Yesterday, the European Commission released its long-awaited proposal for the post-2027 Common Agricultural Policy (CAP). With one of the the biggest funds of the EU budget at stake, this policy will shape farming and rural life for years to come.
July 18, 2025 at 10:57 AM
⚠️ Yesterday, the European Commission released its long-awaited proposal for the post-2027 Common Agricultural Policy (CAP). With one of the the biggest funds of the EU budget at stake, this policy will shape farming and rural life for years to come.
Reposted by Zimbo Boudewijns
Our team quantified how often clinical prediction models are evaluated or used. Spoiler alert: we found more self-reported clinical use in patient care than evidence of thorough evaluation.
www.jclinepi.com/article/S089...
www.jclinepi.com/article/S089...
External validation, impact assessment and clinical utilization of clinical prediction models: a prospective cohort study
We aimed to assess paths taken by clinical prediction models (CPM) after development
by quantifying external validation, impact assessment, and utilization in clinical
practice.
www.jclinepi.com
July 18, 2025 at 8:19 AM
Our team quantified how often clinical prediction models are evaluated or used. Spoiler alert: we found more self-reported clinical use in patient care than evidence of thorough evaluation.
www.jclinepi.com/article/S089...
www.jclinepi.com/article/S089...
Reposted by Zimbo Boudewijns
ADHD is geen trend. Het is een functiebeperking. Mogelijk is het op dit moment ook onze enige taal om mentale onrust te verklaren en te behandelen. In een beter functionerend zorgsysteem kan je met mensen uitzoeken wat er aan de hand is, bijv. door te onderzoeken of er trauma speelt.
July 14, 2025 at 4:59 PM
ADHD is geen trend. Het is een functiebeperking. Mogelijk is het op dit moment ook onze enige taal om mentale onrust te verklaren en te behandelen. In een beter functionerend zorgsysteem kan je met mensen uitzoeken wat er aan de hand is, bijv. door te onderzoeken of er trauma speelt.
Reposted by Zimbo Boudewijns
Vacature: Als datamanager ben je verantwoordelijk voor het beheer van ringgegevens en aflezingen van vogels met kleurmerktekens op cr-birding.org.
Solliciteer via onze website: nioo.knaw.nl/nl/vacatures...
Solliciteer via onze website: nioo.knaw.nl/nl/vacatures...
June 27, 2025 at 2:08 PM
Vacature: Als datamanager ben je verantwoordelijk voor het beheer van ringgegevens en aflezingen van vogels met kleurmerktekens op cr-birding.org.
Solliciteer via onze website: nioo.knaw.nl/nl/vacatures...
Solliciteer via onze website: nioo.knaw.nl/nl/vacatures...
Reposted by Zimbo Boudewijns
We are hiring a new PhD candidate 🎉as part of the No-REGRETS (NOrth Sea Renewable Energy: Gaining the Required Ecological Knowledge for the TranSition) consortium. If you are excited too, have what we are looking for and interested in joining us please apply. #ornithology #animalmovement
New PhD position in our group! Join us to study gull foraging ecology at sea using GPS and accelerometry data! You will be working here Amsterdam Movement Ecology group under supervision of @judyshamounb.bsky.social, @rooskentie.bsky.social and me. Apply here werkenbij.uva.nl/en/vacancies...
Vacancy — PhD Position Gull Foraging Ecology in the North Sea - NO-REGRETS Project
Are you passionate about animal movement ecology? Interested in studying gull foraging ecology at sea? Apply for this unique PhD opportunity at the Department of Theoretical and Computational Ecology ...
werkenbij.uva.nl
June 18, 2025 at 3:20 PM
We are hiring a new PhD candidate 🎉as part of the No-REGRETS (NOrth Sea Renewable Energy: Gaining the Required Ecological Knowledge for the TranSition) consortium. If you are excited too, have what we are looking for and interested in joining us please apply. #ornithology #animalmovement
Reposted by Zimbo Boudewijns
How did I miss this great blog post (and Bluesky post) from @bharrap.bsky.social? As you might expect, I would have lots to say about variable naming conventions. 😄
My favorite line from the blog post:
What makes a bad naming convention?
#1 Not using a convention 😉
benharrap.com/post/2025-03...
My favorite line from the blog post:
What makes a bad naming convention?
#1 Not using a convention 😉
benharrap.com/post/2025-03...
What makes a good variable naming convention – Ben Harrap
benharrap.com
May 23, 2025 at 1:37 AM
How did I miss this great blog post (and Bluesky post) from @bharrap.bsky.social? As you might expect, I would have lots to say about variable naming conventions. 😄
My favorite line from the blog post:
What makes a bad naming convention?
#1 Not using a convention 😉
benharrap.com/post/2025-03...
My favorite line from the blog post:
What makes a bad naming convention?
#1 Not using a convention 😉
benharrap.com/post/2025-03...
Reposted by Zimbo Boudewijns
🔥🔥🔥 2 years of our lives right there (extremely proud of everyone, I’ll write a thread later)
Extremely excited to share the first effort of the Revived Genomics of Personality Consortium: A highly-powered, comprehensive GWAS of the Big Five personality traits in 1.14 million participants from 46 cohorts. www.biorxiv.org/content/10.1...
May 20, 2025 at 11:53 AM
🔥🔥🔥 2 years of our lives right there (extremely proud of everyone, I’ll write a thread later)
Reposted by Zimbo Boudewijns
I'm not sure it's ethical to be conducting associational studies for such socially important exposures as smartphone use in schools.
Either conduct a causal study or don't do anything. Demonstrating the presence or absence of non causal association is not helpful and may end up being misleading.
Either conduct a causal study or don't do anything. Demonstrating the presence or absence of non causal association is not helpful and may end up being misleading.
Smartphone bans in schools are not associated with better mental wellbeing or reduced screen-time out of school buff.ly/C8Zo4PQ
#Smartphones #Screentime #PhoneBans #Schools #YouthMentalHealth
🧵 THREAD
#Smartphones #Screentime #PhoneBans #Schools #YouthMentalHealth
🧵 THREAD
May 13, 2025 at 10:37 AM
I'm not sure it's ethical to be conducting associational studies for such socially important exposures as smartphone use in schools.
Either conduct a causal study or don't do anything. Demonstrating the presence or absence of non causal association is not helpful and may end up being misleading.
Either conduct a causal study or don't do anything. Demonstrating the presence or absence of non causal association is not helpful and may end up being misleading.
Reposted by Zimbo Boudewijns
Code or it did not happen
Folks, always share your code. It doesn’t have to be perfect to be helpful. And if you feel that it’s still too messy or not sufficiently clean to be shared, you shouldn’t submit yet. After all, there could be mistakes in your mess.
May 9, 2025 at 2:19 PM
Code or it did not happen