Giacomo Bignardi
@bignardi.bsky.social
Research Associate at the Social, Genetic & Developmental Psychiatry Centre, Kings College London. Interests: developmental psychology, data science, coffee. www.bignardi.co.uk
Pinned
OSF
osf.io
New preprint with @rogierk.bsky.social @paulbuerkner.com - we introduce "relative measurement uncertainty" - a reliability estimation method that's applicable across a broad class of Bayesian measurement models (e.g., generative-, computational- and item response theory-models osf.io/h54k8
Reposted by Giacomo Bignardi
as I'm revising my course materials, I keep stumbling upon cool @mc-stan.org developments.
Current favorites:
1. your model has funnels and you exhausted reparametrization ideas: metric = "dense_e" makes your HMC learn about covariance btw parameters. Sloooow, but effective!
1/
Current favorites:
1. your model has funnels and you exhausted reparametrization ideas: metric = "dense_e" makes your HMC learn about covariance btw parameters. Sloooow, but effective!
1/
February 4, 2026 at 1:30 PM
as I'm revising my course materials, I keep stumbling upon cool @mc-stan.org developments.
Current favorites:
1. your model has funnels and you exhausted reparametrization ideas: metric = "dense_e" makes your HMC learn about covariance btw parameters. Sloooow, but effective!
1/
Current favorites:
1. your model has funnels and you exhausted reparametrization ideas: metric = "dense_e" makes your HMC learn about covariance btw parameters. Sloooow, but effective!
1/
Hot take: one of the main benefits of running data analyses in 🐬 Docker 🐬 isn't reproducibility, but saving yourself (or your lab) hundreds or thousands of pounds in computer costs*. Here's how... #datascience #docker #rstudio #python
*for a very niche set of people
*for a very niche set of people
January 28, 2026 at 6:51 PM
Hot take: one of the main benefits of running data analyses in 🐬 Docker 🐬 isn't reproducibility, but saving yourself (or your lab) hundreds or thousands of pounds in computer costs*. Here's how... #datascience #docker #rstudio #python
*for a very niche set of people
*for a very niche set of people
Reposted by Giacomo Bignardi
video making very strong (& problematic) claims about the supposed damaging effects of screen time on children's education & cognition is trending on youtube (from the US senate committee)... www.youtube.com/watch?v=Fd-_...
Doctor on How Screen Time Hurts Kids' Cognitive Development
YouTube video by C-SPAN
www.youtube.com
January 22, 2026 at 10:56 AM
video making very strong (& problematic) claims about the supposed damaging effects of screen time on children's education & cognition is trending on youtube (from the US senate committee)... www.youtube.com/watch?v=Fd-_...
video making very strong (& problematic) claims about the supposed damaging effects of screen time on children's education & cognition is trending on youtube (from the US senate committee)... www.youtube.com/watch?v=Fd-_...
Doctor on How Screen Time Hurts Kids' Cognitive Development
YouTube video by C-SPAN
www.youtube.com
January 22, 2026 at 10:56 AM
video making very strong (& problematic) claims about the supposed damaging effects of screen time on children's education & cognition is trending on youtube (from the US senate committee)... www.youtube.com/watch?v=Fd-_...
Reposted by Giacomo Bignardi
On Tues, February 17th I'll be giving a talk and short workshop on (narratively) generative modeling for Princeton's psychology department, psychology.princeton.edu/news-events/.... The talk (and maybe the workshop) will be live-streamed for those interested in attending remotely.
Michael Betancourt - Chief Research Scientist, Symplectomorphic, LLC
Generative ModelingOver the last few years the term "generative modeling" has become increasingly popular. The precise definition of the term, however, tends to be vague and often inconsistent across...
psychology.princeton.edu
January 21, 2026 at 5:16 AM
On Tues, February 17th I'll be giving a talk and short workshop on (narratively) generative modeling for Princeton's psychology department, psychology.princeton.edu/news-events/.... The talk (and maybe the workshop) will be live-streamed for those interested in attending remotely.
Reposted by Giacomo Bignardi
I've used Lavaan almost every (work)day for 15 years, but this open source labour of love has never received proper institutional support. I'm delighted to be a small part of an 1.5M OpenScienceNL award, led by Jorgensen, to completely revamp and futureproof Lavaan www.openscience.nl/en/news/45-p...
December 18, 2025 at 7:44 AM
I've used Lavaan almost every (work)day for 15 years, but this open source labour of love has never received proper institutional support. I'm delighted to be a small part of an 1.5M OpenScienceNL award, led by Jorgensen, to completely revamp and futureproof Lavaan www.openscience.nl/en/news/45-p...
Wow if you have a UK student loan this is definitely worth checking, Xmas is on @martinlewis.moneysavingexpert.com again this year 🎄🎄https://www.moneysavingexpert.com/students/student-loan-overpayment-refund
Student loan overpayments
This MoneySavingExpert guide can help you check if you've overpaid your student loan and reclaim the cash if so. 10,000s overpay their student loans – have you?
www.moneysavingexpert.com
December 9, 2025 at 11:52 AM
Wow if you have a UK student loan this is definitely worth checking, Xmas is on @martinlewis.moneysavingexpert.com again this year 🎄🎄https://www.moneysavingexpert.com/students/student-loan-overpayment-refund
Reposted by Giacomo Bignardi
In 2021 we reported that live learning outperformed recorded learning. In a new preregistered analysis, my first senior-author paper led by Stan de Visser (pre-print), we find that this benefit does not increase with interactivity. The potential to interact may be enough to boost learning. A thread:
December 1, 2025 at 11:26 AM
In 2021 we reported that live learning outperformed recorded learning. In a new preregistered analysis, my first senior-author paper led by Stan de Visser (pre-print), we find that this benefit does not increase with interactivity. The potential to interact may be enough to boost learning. A thread:
Reposted by Giacomo Bignardi
Happy to share my new paper published in @nathumbehav.nature.com: A critical look at statistical power in computational modeling studies, particularly those based on model selection.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
November 17, 2025 at 6:13 PM
Happy to share my new paper published in @nathumbehav.nature.com: A critical look at statistical power in computational modeling studies, particularly those based on model selection.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Reposted by Giacomo Bignardi
We wrote an article explaining why you shouldn't put several variables into a regression model and report which are statistically significant - even as exploratory research. bmjmedicine.bmj.com/content/4/1/.... How did we do?
October 27, 2025 at 5:39 PM
We wrote an article explaining why you shouldn't put several variables into a regression model and report which are statistically significant - even as exploratory research. bmjmedicine.bmj.com/content/4/1/.... How did we do?
Reposted by Giacomo Bignardi
New paper by brilliant final yer PhD student Blanca Piera Pi-Sunyer and colleagues, including 3 undergraduate students (Evans, Ratcliffe, Janaarthanan) 🤩
The Relationship between Perceived Friendship Quality and Self-Judgements in Adolescent Girls from London
journals.sagepub.com/doi/epub/10....
The Relationship between Perceived Friendship Quality and Self-Judgements in Adolescent Girls from London
journals.sagepub.com/doi/epub/10....
October 20, 2025 at 2:34 PM
New paper by brilliant final yer PhD student Blanca Piera Pi-Sunyer and colleagues, including 3 undergraduate students (Evans, Ratcliffe, Janaarthanan) 🤩
The Relationship between Perceived Friendship Quality and Self-Judgements in Adolescent Girls from London
journals.sagepub.com/doi/epub/10....
The Relationship between Perceived Friendship Quality and Self-Judgements in Adolescent Girls from London
journals.sagepub.com/doi/epub/10....
Reposted by Giacomo Bignardi
Blanca Piera Pi-Sunyer on how to make the world a better place for young people, the cumulative impact of adversity & how to mitigate it in the Gates Cambridge podcast, So, now what? - @cambridgeuni.bsky.social
January 31, 2025 at 10:32 AM
Blanca Piera Pi-Sunyer on how to make the world a better place for young people, the cumulative impact of adversity & how to mitigate it in the Gates Cambridge podcast, So, now what? - @cambridgeuni.bsky.social
Reposted by Giacomo Bignardi
This is really neat. I have borrowed the reliability() function to my `easyRasch` package, and use plausible values instead of fully Bayesian estimation to produce similar estimates/CIs, see code example below. RMU point estimates are similar to EAP reliability.
pgmj.github.io/easyRasch/re...
pgmj.github.io/easyRasch/re...
New preprint with @rogierk.bsky.social @paulbuerkner.com - we introduce "relative measurement uncertainty" - a reliability estimation method that's applicable across a broad class of Bayesian measurement models (e.g., generative-, computational- and item response theory-models osf.io/h54k8
OSF
osf.io
October 10, 2025 at 2:10 PM
This is really neat. I have borrowed the reliability() function to my `easyRasch` package, and use plausible values instead of fully Bayesian estimation to produce similar estimates/CIs, see code example below. RMU point estimates are similar to EAP reliability.
pgmj.github.io/easyRasch/re...
pgmj.github.io/easyRasch/re...
I've added a new example to our paper's repo, demonstrating how our reliability method replicates Cronbach's alpha for a simple model, but also how our method can account for: (i) binary data, (ii) varying numbers of items per pps, & (iii) improvement over trials www.bignardi.co.uk/8_bayes_reli...
October 8, 2025 at 11:31 AM
I've added a new example to our paper's repo, demonstrating how our reliability method replicates Cronbach's alpha for a simple model, but also how our method can account for: (i) binary data, (ii) varying numbers of items per pps, & (iii) improvement over trials www.bignardi.co.uk/8_bayes_reli...
New preprint with @rogierk.bsky.social @paulbuerkner.com - we introduce "relative measurement uncertainty" - a reliability estimation method that's applicable across a broad class of Bayesian measurement models (e.g., generative-, computational- and item response theory-models osf.io/h54k8
OSF
osf.io
October 1, 2025 at 8:17 AM
New preprint with @rogierk.bsky.social @paulbuerkner.com - we introduce "relative measurement uncertainty" - a reliability estimation method that's applicable across a broad class of Bayesian measurement models (e.g., generative-, computational- and item response theory-models osf.io/h54k8
📣New study 📣 We examined the prevalence of food insecurity and its association with mental health and wellbeing, using the 2023 @oxwell.bsky.social survey of 38,430 children and young people aged 8–19 in England with @sjblakemore.bsky.social @minafazeloxford.bsky.social doi.org/10.1002/jcv2...
JCPP Advances | ACAMH Child Development Journal | Wiley Online Library
BackgroundWe aimed to assess the prevalence of food insecurity reported by children and young people in four areas of England in 2023 and examine its association with mental health and wellbeing. Met...
doi.org
September 24, 2025 at 12:05 PM
📣New study 📣 We examined the prevalence of food insecurity and its association with mental health and wellbeing, using the 2023 @oxwell.bsky.social survey of 38,430 children and young people aged 8–19 in England with @sjblakemore.bsky.social @minafazeloxford.bsky.social doi.org/10.1002/jcv2...
Reposted by Giacomo Bignardi
New paper! Excellent work by @bignardi.bsky.social and @minafazeloxford.bsky.social, who leads the Oxwell study
The prevalence of food insecurity and its relationship with wellbeing in a large, cross-sectional study of children and young people in England
Out soon. Preprint:
osf.io/preprints/ps...
The prevalence of food insecurity and its relationship with wellbeing in a large, cross-sectional study of children and young people in England
Out soon. Preprint:
osf.io/preprints/ps...
OSF
osf.io
August 31, 2025 at 10:54 AM
New paper! Excellent work by @bignardi.bsky.social and @minafazeloxford.bsky.social, who leads the Oxwell study
The prevalence of food insecurity and its relationship with wellbeing in a large, cross-sectional study of children and young people in England
Out soon. Preprint:
osf.io/preprints/ps...
The prevalence of food insecurity and its relationship with wellbeing in a large, cross-sectional study of children and young people in England
Out soon. Preprint:
osf.io/preprints/ps...
Reposted by Giacomo Bignardi
Delighted to be hiring a new Clinical Psychology Lecturer to come and join our vibrant environment at the SGDP Centre @kingsioppn.bsky.social @kingscollegelondon.bsky.social please share!
my.corehr.com/pls/coreport...
my.corehr.com/pls/coreport...
my.corehr.com
August 7, 2025 at 8:39 AM
Delighted to be hiring a new Clinical Psychology Lecturer to come and join our vibrant environment at the SGDP Centre @kingsioppn.bsky.social @kingscollegelondon.bsky.social please share!
my.corehr.com/pls/coreport...
my.corehr.com/pls/coreport...
Reposted by Giacomo Bignardi
@drandreahoward.bsky.social, hold my beer..
Latent class growth models are worse than useless, and we've known this for more than 20 years.
(See Bauer 2007)
Latent class growth models are worse than useless, and we've known this for more than 20 years.
(See Bauer 2007)
i’m not going to write a thread today about problems with latent class growth analyses nope nope NOPE i won’t do it
June 20, 2025 at 7:05 PM
@drandreahoward.bsky.social, hold my beer..
Latent class growth models are worse than useless, and we've known this for more than 20 years.
(See Bauer 2007)
Latent class growth models are worse than useless, and we've known this for more than 20 years.
(See Bauer 2007)
Reposted by Giacomo Bignardi
🚨 New paper alert! 🚨
Larysa Zasiekina, @sjblakemore.bsky.social, Iryna Hlova, @bignardi.bsky.social and I investigated the prevalence of PTSD in adolescents who have experienced war.
Our systematic review and meta-analysis is linked below, but read on for highlights… 🧵
doi.org/10.1080/2000...
Larysa Zasiekina, @sjblakemore.bsky.social, Iryna Hlova, @bignardi.bsky.social and I investigated the prevalence of PTSD in adolescents who have experienced war.
Our systematic review and meta-analysis is linked below, but read on for highlights… 🧵
doi.org/10.1080/2000...
Prevalence of war-related posttraumatic stress disorder in adolescents: a systematic review and meta-analysis
Background: Posttraumatic stress disorder is common in civilians who are currently experiencing, or who have experienced, war. Most previous studies have focused on adult populations and, despite t...
doi.org
June 3, 2025 at 12:23 PM
🚨 New paper alert! 🚨
Larysa Zasiekina, @sjblakemore.bsky.social, Iryna Hlova, @bignardi.bsky.social and I investigated the prevalence of PTSD in adolescents who have experienced war.
Our systematic review and meta-analysis is linked below, but read on for highlights… 🧵
doi.org/10.1080/2000...
Larysa Zasiekina, @sjblakemore.bsky.social, Iryna Hlova, @bignardi.bsky.social and I investigated the prevalence of PTSD in adolescents who have experienced war.
Our systematic review and meta-analysis is linked below, but read on for highlights… 🧵
doi.org/10.1080/2000...
Amazing funded phd opportunity with great supervisors👇👇👇👇👇
Funded PhD opportunity with @sjblakemore.bsky.social and I, at Cambridge. We are looking for someone interested in developmental science, to start in the coming academic year. Please share it with anyone you think might be interested (see details attached 😁).
drive.google.com/file/d/1RIvg...
drive.google.com/file/d/1RIvg...
Funded PhD opportunity.pdf
drive.google.com
May 27, 2025 at 3:15 PM
Amazing funded phd opportunity with great supervisors👇👇👇👇👇
Reposted by Giacomo Bignardi
Revealed:
🥣 Diluted juice, no fruit or hot food: how schools are cutting their breakfast club offering due to squeezed funding in government pilot
🥣 Concerns about SEND provision at “inclusive” breakfast clubs
🥣 Diluted juice, no fruit or hot food: how schools are cutting their breakfast club offering due to squeezed funding in government pilot
🥣 Concerns about SEND provision at “inclusive” breakfast clubs
A month into one of the government's flagship education policies, early adopter breakfast club schools tell Tes about the cuts they have been forced to make to make funds go further.
Plus, a quarter have already considered dropping out entirely.
www.tes.com/magazine/new...
Plus, a quarter have already considered dropping out entirely.
www.tes.com/magazine/new...
Breakfast club schools dilute juice and avoid fruit as funds fall short
Many schools involved in the pilot scheme for free breakfast clubs are worried about not having enough funding to support pupils with SEND, a Tes survey reveals
www.tes.com
May 19, 2025 at 8:49 AM
Revealed:
🥣 Diluted juice, no fruit or hot food: how schools are cutting their breakfast club offering due to squeezed funding in government pilot
🥣 Concerns about SEND provision at “inclusive” breakfast clubs
🥣 Diluted juice, no fruit or hot food: how schools are cutting their breakfast club offering due to squeezed funding in government pilot
🥣 Concerns about SEND provision at “inclusive” breakfast clubs
Reposted by Giacomo Bignardi
Does anyone know of an available dataset including (1) passively collected data on what Apps are being used in the foreground of one's phone and when, & (2) mental health questionnaire measures (from 1 or many time points)?
Thank you 🙏
Thank you 🙏
April 4, 2025 at 9:28 AM
Does anyone know of an available dataset including (1) passively collected data on what Apps are being used in the foreground of one's phone and when, & (2) mental health questionnaire measures (from 1 or many time points)?
Thank you 🙏
Thank you 🙏
Reposted by Giacomo Bignardi
Our approach to understanding how adversities impact adolescent development often neglects the specificity and complexity of adolescence. In our new review, we propose the adolescent adverse experiences framework to capture adverse experiences at multiple levels: www.nature.com/articles/s41...
A framework for understanding adverse adolescent experiences - Nature Human Behaviour
Adolescence (ages 10–24) is characterized by cognitive, behavioural and social development. This Review proposes the adverse adolescent experiences (AAEs) framework to categorize and examine potential...
www.nature.com
March 3, 2025 at 4:05 PM
Our approach to understanding how adversities impact adolescent development often neglects the specificity and complexity of adolescence. In our new review, we propose the adolescent adverse experiences framework to capture adverse experiences at multiple levels: www.nature.com/articles/s41...
Reposted by Giacomo Bignardi
Data published today from the English Housing Survey shows overcrowding for social tenants having almost doubled in the last 20 years - now nearly one in 10 are overcrowded.
January 30, 2025 at 6:56 PM
Data published today from the English Housing Survey shows overcrowding for social tenants having almost doubled in the last 20 years - now nearly one in 10 are overcrowded.