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Statistical distributions in LCA and converting between different representations of these distributions.

The master's specialisation Methodology and Statistics in Psychology includes courses, a thesis and an internship. Teaching takes place in the form of seminars and small-group lectures and practicals, and is assessed primarily by written coursework and reports of empirical projects carried out individually…

The ability to collect and interpret huge quantities of data has become indispensable to society and academia. Leiden University is a knowledge and expertise centre for data science that places the emphasis on interdisciplinary collaboration and innovation.

We explored the Universe using weak gravitational lensing, a phenomenon that occurs when light from distant galaxies is bent by the gravitational fields of closer cosmic objects, much like how a lens distorts light.

We explored how to morphologically classify well-resolved jetted radio-loud active galactic nuclei (RLAGN) in the LOw Frequency Array (LOFAR) Two-metre Sky Survey (LoTSS) using machine learning.

Methodology & Statistics offers bachelor's courses and a master's specialisation.

When psychologists repeated a hundred studies in 2015, their results differed in two-thirds of the studies. ‘Research into research is not a luxury but a necessity,’ says Professor of Methodology and Statistics of Psychological Research Mark de Rooij. ‘My aim is to improve psychological research, to think…

The programme group Research Methods and Statistics is part of the Institute of Education and Child Studies. This group is located in the Faculty of Social and Behavioural Sciences of Leiden University near Central Station.

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The programme is designed to train you as independent researcher, while equipping you with the necessary skills to advance your career.

LUCDH offers 5 faculty-wide elective courses to improve your practical skills and thinking about digital tools and media. These courses are open and useful for all students of the Humanities. Check back for updates to 2026.

This project develops methods for ensuring the anonymity of individuals in social network data.

A master's degree in Psychology at Leiden University combines theoretical knowledge with academic and professional skills, making you an attractive candidate for many employers.

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Promotores: F.H.J. Redig, W.T.F. den Hollander

The Graduate School offers various courses on English and Methodology & Statistics to PhD candidates.

The objective of this project is to fundamentally improve our understanding of the ways in which science progresses. Empirical studies have used bibliographic metadata to provide relevant insights, but these studies have failed to tell us how science progresses. Supported by computational advances and…

Data analysis with Python and R are rapidly becoming essential skills for modern scientists. Therefore, we are offering courses to develop your scientific computing skills. Those courses are optional for LACDR PhD candidates.

We study the structure, dynamics and physics of complex networks emerging from the intricate interconnectedness of the constituents of large systems.

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Our group is part of the Metabolomics and Analytics Centre where we accompany the data from its acquisition all the way to the publication of identified associations and biomarkers for a range of human diseases. The generated data of the metabolic measurements are assessed using an in-house quality…

The Mathematics master’s programme provides a solid theoretical foundation and prepares you to work in multidisciplinary and international environments. With a Leiden Mathematics degree, you’ll have the tools to pursue opportunities worldwide in research, industry, and beyond.

The Mathematics and SCS master specialisation gives you the opportunity to combine Mathematics research with different aspects of science communication.

The two-year research programme Applied Mathematics offers courses at an advanced level. There is a large degree of freedom in choosing one’s own topics. Some of the courses are given at national level, in the Dutch Mastermath programme. The programme concludes with the preparation of a master’s the…

Combine training in Mathematics research with different aspects of business studies. Learn to build bridges between science and business.

PhD defence

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In meta-analysis, heterogeneity often exists between studies. In such cases, it is essential to investigate the sources of heterogeneity and understand the relationship between effect size and study characteristics (i.e., moderators).