Lennert J. Groot

PhD Research

I wrote my dissertation as a PhD candidate in the research project No Data Left Behind. This project was funded through the VIDI grant awarded to dr. Suzanne Jak. In this project, we aimed to broaden the scope of research questions that can be answered through meta-analytical structural equation modeling (MASEM). In particular, I investigated the possibilities of synthesizing raw datasets, instead of summary statistics, when conducting MASEM. Working on techniques for IPD MASEM is an effort to allow researchers to synthesize these growing data archives to answer the most complex research questions. I will defend my dissertation titled "In Between Methods: Developing and Evaluating Analysis Approaches for Individual Participant Data MASEM" on November 16, 2026.

Postdoctoral Research

In my current postdoctoral research position I work on the Media and Web Diets Observatory (a part of the Macroscope project), supervised by prof. dr. Theo Araujo and prof. dr. Jessica Piotrowski. In this project, I am again working with large heterogeneous data sets and considering how these can be used to answer a wide range of research questions. For the Observatory, we will be using data donation procedures to create a representative, longitudinal dataset of thousands of individuals through the LISS panel (Centerdata). Doing so, we are linking meso-level public debate and micro-level attitudes and behaviors to participants’ (social) media consumption. Future scholars and students will be able to use this data to connect the dots between what we consume online and how attitudes and behaviors change over time.