Maarten van Smeden
@maartenvsmeden.bsky.social
statistician • associate prof • team lead health data science and head methods research program at julius center • director ai methods lab, umc utrecht, netherlands • views and opinions my own
Prediction models that are used to guide medical decisions are usually regulated under medical device regulation. This means, putting a calculator out there to promote the use your new prediction model is likely to break some rules.
November 1, 2025 at 1:46 PM
Prediction models that are used to guide medical decisions are usually regulated under medical device regulation. This means, putting a calculator out there to promote the use your new prediction model is likely to break some rules.
The lasso works really well in particular settings and for particular purposes. If you are after high prediction performance alone and you have a rather large sample size, it can be an excellent choice indeed. But most analytical goals are not only about prediction
October 12, 2025 at 1:57 PM
The lasso works really well in particular settings and for particular purposes. If you are after high prediction performance alone and you have a rather large sample size, it can be an excellent choice indeed. But most analytical goals are not only about prediction
This is right tho. Let’s therefore call them sensitivity positive predictive value curves bsky.app/profile/laur...
9. It's annoying how often the same model is "discovered" in a different field, with a completely different set of jargon
August 19, 2025 at 3:28 PM
This is right tho. Let’s therefore call them sensitivity positive predictive value curves bsky.app/profile/laur...
For details: arxiv.org/abs/2412.10288
Performance evaluation of predictive AI models to support medical decisions: Overview and guidance
A myriad of measures to illustrate performance of predictive artificial intelligence (AI) models have been proposed in the literature. Selecting appropriate performance measures is essential for predi...
arxiv.org
August 19, 2025 at 3:24 PM
For details: arxiv.org/abs/2412.10288
TL;DR: Explainable AI models often don't do a good job explaining. They can be very useful for description. We should be really careful when using Explainable AI in clinical decision making, and even when judging face validity of AI models
Excellently led by @alcarriero.bsky.social
Excellently led by @alcarriero.bsky.social
August 11, 2025 at 6:54 AM
TL;DR: Explainable AI models often don't do a good job explaining. They can be very useful for description. We should be really careful when using Explainable AI in clinical decision making, and even when judging face validity of AI models
Excellently led by @alcarriero.bsky.social
Excellently led by @alcarriero.bsky.social
This is, however, not clever or safe writing, it is a bad collective habit that needs to stop. Not by avoiding references to causality but by clear referencing to it
pubmed.ncbi.nlm.nih.gov/37286459/
pubmed.ncbi.nlm.nih.gov/37286459/
Guidelines for Reporting Observational Research in Urology: The Importance of Clear Reference to Causality - PubMed
Observational studies often dance around the issue of causality. We propose guidelines to ensure that papers refer to whether or not the study aim is to investigate causality, and suggest language to ...
pubmed.ncbi.nlm.nih.gov
July 31, 2025 at 8:33 AM
This is, however, not clever or safe writing, it is a bad collective habit that needs to stop. Not by avoiding references to causality but by clear referencing to it
pubmed.ncbi.nlm.nih.gov/37286459/
pubmed.ncbi.nlm.nih.gov/37286459/
And taking this analogy one step further: it gives genuine phone repair shops a bad name
July 24, 2025 at 8:26 AM
And taking this analogy one step further: it gives genuine phone repair shops a bad name
Clients: “I want to find real, meaningful clusters”
Me: “I want world peace, which is more likely to happen than what you want”
Me: “I want world peace, which is more likely to happen than what you want”
July 11, 2025 at 12:45 PM
Clients: “I want to find real, meaningful clusters”
Me: “I want world peace, which is more likely to happen than what you want”
Me: “I want world peace, which is more likely to happen than what you want”
In medicine they are called "risk factors" and, of course, you want all "important" risk factors in your model all the time
Unless a risk factor is not statistically significant then you can drop that factor without issues
Unless a risk factor is not statistically significant then you can drop that factor without issues
June 27, 2025 at 7:52 AM
In medicine they are called "risk factors" and, of course, you want all "important" risk factors in your model all the time
Unless a risk factor is not statistically significant then you can drop that factor without issues
Unless a risk factor is not statistically significant then you can drop that factor without issues
Also, the fact that a model with the best AUC doesn't always mean the model makes the best predictions is lost in such cases too
June 27, 2025 at 7:35 AM
Also, the fact that a model with the best AUC doesn't always mean the model makes the best predictions is lost in such cases too