Willem Sleegers

Senior Behavioral Scientist at Rethink Priorities

About

I’m a Senior Behavioral Scientist at Rethink Priorities. I am part of the survey team, which means I conduct research on attitude assessments and attitude change, using surveys and experimental designs. Before joining Rethink Priorities, I was an assistant professor in the Department of Social Psychology at Tilburg University. On this website you can find information about some of the projects I’m involved in. I also blog about various topics related to my work.

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Projects

Blog posts

Simulation-based power curves

In a previous post I covered how to perform simulation-based power analyses. A limitation in that post is that usually the question is not what our power is, but rather which sample size gives us the desired power. With the code from my previous post you can get to the right sample size by changing the sample size parameters and then checking whether this gives you enough power. It’s fine, but it’s a little bit of a hassle.

Nov 9, 2021

Simulation-based power analyses

Simulation-based power analyses make it easy to understand what power is: Power is simply counting how often you find the results you expect to find. Running simulation-based power analyses might be new for some, so in this blog post I present code to simulate data for a range of different scenarios.

Oct 23, 2021

The right order of method sections

Method sections in academic (psychology) papers usually consist of the following sections: Participants, Design, Procedure, and Materials. They also tend to be presented in this order. But is this, generally speaking, the right order? I don’t think so.

Jul 8, 2021

CV

I’m an Senior Behavioral Scientist at Rethink Priorities. I have recently left academia after having built up 10 years of research experience, with publications of both scientific papers in peer-reviewed journals, as well as software publications. It should be no surprise then that my skill set consists of research skills (e.g., experimental design, data analysis, writing) and technical skills (e.g., programming). I now look forward to applying my skills to topics of great impact together with my colleagues at Rethink Priorities.

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About

Projects

Animal welfare

Cognitive dissonance

statcheck

tidystats

Blog posts

Simulation-based power curves

Simulation-based power analyses

The right order of method sections

CV