Martijn Heymans

@ESteyerberg @MaartenvSmeden @UMCUtrecht @CarlMoons @bds_lumc Succes Ewout!

@MaartenvSmeden @UMCUtrecht Happy to confirm my transfer to Julius Center @umcutrecht! Looking forward to new collaborations and strengthening connections with many, including @MaartenvSmeden and @CarlMoons. Sorry to be leaving @bds_lumc, after seven great years in Leiden full of new experiences.

The big news is out! We are happy to welcome @ESteyerberg this summer as the new division leader of the Julius Center @umcutrecht. Looking forward to the renewed collaboration

In AJE: Missing data? Don't drop observations! A longitudinal study in @hrsisr shows multiple imputation with predictive mean matching performs well, is easy to implement, and helps recover unbiased results doi.org/10.1093/aje/kw…

Just released on cran, psfmi package version 1.4.0 including new possibility to pool and select stratified Cox models after Multiple Imputation #rstats mwheymans.github.io/psfmi/

@T_Allen1998 Thanks T. Allen! I am working on a pdf version to download, but can not say when it will become available😅

@mwheymans I came across your excellent book bookdown.org/mwheymans/book… . Is there a hard copy or pdf version I can buy? Very logical and easy to follow. Thanks.

@RoelWing just published his last PhD paper in the @JPhysiother! A prognostic model for neck-related disability in patients with sub-acute neck pain was externally validated at 6 weeks with acceptable discrimination and calibration. sciencedirect.com/science/articl…

Finding it hard to understand the Cox model and baseline hazard in R. See my post that may help you! missingdatasolutions.rbind.io/2022/12/cox-ba… #RStats #rstudio

His publications are suggested reading for anyone interested in prognostic modelling for neck pain. Starting with this systematic review... pubmed.ncbi.nlm.nih.gov/29289589/ ...to this paper failing to externally validate the most promising models: pubmed.ncbi.nlm.nih.gov/34301471/ 2/3

@PhysioAlex @RoelWing @ErasmusMC @bartkoes @ArianneVerhagen Great defense!

Very proud co-promotor moment: On 15th December 2022, @RoelWing successfully (and very well!) defended his PhD thesis on prognostic modelling for patients with neck pain in primary care @ErasmusMC. @bartkoes @mwheymans Emiel van Trijffel @ArianneVerhagen 1/3

A systematic review shows no performance benefit of machine learning over logistic regression for clinical prediction models jclinepi.com/article/S0895-…

@GSCollins @JClinEpi @Richard_D_Riley @MaartenvSmeden @CarlMoons @hans_reitsma @pauladhiman @RamBajpai16 @CSMOxford Great line up!

NEW PAPER in @JClinEpi -> "focus is required on handling of missing values, methods for internal validation, & reporting of calibration to improve [...] studies on #machinelearning-based prediction models" tinyurl.com/3zfjs5wu #OpenAccess #StatsTwitter #DataScience #MLtwitter

@f2harrell @vandy_biostat @VUDataScience Thanks for the incredible work you do for the R community and beyond!

Version 4.7-2 of 32 year-old R Hmisc package available on CRAN with lots of updates hbiostat.org/R/Hmisc #rstats #Statistics #biostatistics @vandy_biostat @VUDataScience

@SteveStuWill How academics lose their jobs...🙈

Scary: 73 teams tested the same hypotheses with the same data. Some found negative results, some positive, some nada. No effect of expertise or confirmation bias. "Idiosyncratic researcher variability is a threat to the reliability of scientific findings." osf.io/preprints/meta…

@stephensenn Great picture!

When the terrain get’s more exciting, I like to give my wife the thrill of going first. #gentlemanly #considerate

Proud to present this paper about Handling Missing Data in Clinical Research as a Key Concept in Clinical Epidemiology @JClinEpi eur04.safelinks.protection.outlook.com/?url=https%3A%…

Ever wondered whether it is necessary to impute cost data before using longitudinal linear mixed-model analyses? Check out our paper below for the answer! @hannekevandonge @VroomenJanet @mwheymans doi.org/10.1007/s10198…

Great paper with a great team! ejnmmires.springeropen.com/articles/10.11…

@Richard_D_Riley @unibirmingham @UoB_IAHR @unibirm_MDS @oldjoeclock @deeksj Congratulations with this step and succes with your work there!

Personal news👇 In November, I will move to the University of Birmingham (@unibirmingham) as Chair of Biostatistics Excited to work with a leading Biostats team in @UoB_IAHR @unibirm_MDS & to continue our applied & methods work & courses in prognosis, prediction & meta-analysis

#openaccess Time lags and time interactions in mixed-effects models impacted longitudinal mediation effect estimates jclinepi.com/article/S0895-…

@BhramarBioStat @Richard_D_Riley See journals.sagepub.com/doi/10.1177/15…