About the authors

Andrie de Vries

Andrie started to use R in 2009 to analyze survey data, and he has been continually impressed by the ability of the open source community to innovate and create phenomenal software.

Andrie is director of PentaLibra, a boutique market research firm specializing in surveys and statistical analysis. He has contributed two R packages to CRAN and is developing several packages to make the analysis and reporting of survey data easier.  He is also actively involved in the development of LimeSurvey, the open source survey management system.

To maintain equilibrium in his life, he is studying towards a Yoga teacher diploma at the Krishnamacharya Healing and Yoga foundation.


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Joris Meys

Joris is a statistical consultant and R programmer in the department of Mathematical Modelling, Statistics and Bioinformatics at Ghent University (Belgium).

After completing a masters degree in Biology, he worked six years both in environmental research and management before starting an advanced master in Statistical Data Analysis. Joris writes packages for both specific projects and general implementation of methods developed at his department, and is the maintainer of several packages on R-Forge. He co-authored as statistical expert on a number of scientific papers.

To balance science with culture, he spends most of his spare time playing saxophone in a couple of local bands.


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