Piet Stam
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R
digital transformation
risk equalization
sports analytics

My blog posts

Image by [Chubbylilrabbit - Own work](https://commons.wikimedia.org/w/index.php?curid=96172095), CC BY-SA 4.0, adapted by Piet Stam

Regression Analysis of Aggregate Data in R
R
Aggregate microdata with a continuous outcome variable and categorical predictors and derive the individual-level regression coefficients and standard errors afterwards.
Piet Stam
Feb 26, 2023

Photo by [Luis Reyes](https://unsplash.com/@tuga760?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText) on [Unsplash](https://unsplash.com/s/photos/weights?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText)

Use tidymodels with weighted and unweighted data
R
It took some time to figure out how to use frequency weights when fitting a model in the tidymodels framework. Here is the code to do that.
Piet Stam
Sep 19, 2022

Image credit: Photo by [Ben](https://unsplash.com/@gudguyben?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText) on [Unsplash](https://unsplash.com/s/photos/keyboard-mechanical?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText)

Shortening my URL shortener
digital transformation
In my presentation slides, I would like to refer people with easy-to-remember URLs. So I created an URL shortener (and shortened the use of it even more).
Piet Stam
Sep 4, 2022

Image credit: [**Open Knowledge Foundation**](https://blog.okfn.org/2020/04/16/coronavirus-why-an-open-future-has-never-been-more-important/)

Coronavirus apps: better safe than sorry (in Dutch)
digital transformation
Piet Stam, Peter Nobels and Marco Woesthuis propose ten privacy conditions that a safe corona app must meet.
Piet Stam
Apr 12, 2020

Image credit: [**René Bouwman/De Telegraaf**](https://www.telegraaf.nl/sport/2205027/van-bommel-ik-heb-de-bagage-die-nodig-is)

The ball is round (in Dutch)
sports analytics
I have predicted the results of the decisive matches in the Eredivisie season 2018/2019 with my hierarchical Bayesian Poisson model. Betting on these results gave me a…
Piet Stam
May 10, 2019

Image credit: [**Wikimedia**](https://nl.wikipedia.org/wiki/Thomas_Bayes#/media/Bestand:Thomas_Bayes.gif)

Modeling match results in the Dutch Eredivisie using a hierarchical Bayesian Poisson model
sports analytics
R
This is an application of the original work of Rasmus Baath to the Dutch football competiton. The model is trained on the game results of 5 historical seasons.
Piet Stam
May 10, 2019

Image credit: [**Kim Stellingwerf/RTV Drenthe**](https://www.rtvdrenthe.nl/nieuws/136382/met-de-trein-via-zwolle-houd-rekening-met-vertraging)

Personal Health Train: an application to risk equalization (in Dutch)
risk equalization
digital transformation
The concept of the Personal Health Train promises a major step forward by facilitating sharing privacy-sensitive data in a decentralized way. In order to actually get this…
Piet Stam
Feb 19, 2019

Image credit: [**Jesse Stam**](http://jesse-stam.nl/wp-content/gallery/training-thialf-24-okt-2017/DSC_9747.JPG)

Speed skating app dockerized
sports analytics
digital transformation
The first version of the Shiny app had to be installed on a VM with a Shiny server running. Now that I created a Docker version, it is much easier to deploy the app on a VM…
Piet Stam
Jun 4, 2018

Image credit: [**Jesse Stam**](http://jesse-stam.nl/wp-content/gallery/trainingswedstrijd-thialf-19-11-2016/DSC_7775.JPG)

Speed skating app for talent scouting and development
sports analytics
R
digital transformation
In the Netherlands, people start skating at a young age. Some of them will break Olympic records later on. Which kids have the talent to become a professional?
Piet Stam
Feb 13, 2018
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