A sunny sky and a not-too-fresh breeze marked the beginning of the Twente R User Group. While enjoying drinks and tapas in the lush Twente countryside, both students and staff from several departments of the University of Twente met and exchanged experiences and ambitions regarding their use of the statistical programming software R.
The level of experience and type of ambitions varied greatly. Some hardcore programmers want to familiarize themselves with R to broaden their horizon, some use R for Monte Carlo simulation, some merely want to use a platform for data manipulation and analysis that does not require an expensive license, and some use R because it can do types of analyses that can’t be carried out using SPSS. Several members in the group were interested in parallelization and integration with C++ code to speed up analyses.
Martin Schmettow was the first to present. Martin, working at the department of Cognitive Psychology and Ergonomics, presented how to deal with card sorting data, showing some code how to construct graph data from the card sorting data (represented as lists of lists) using a recursive function, and how to best present analysis results: hot-spot plots rather than dendograms. Several libraries and their functions were discussed, like for instance plyr. Powerpoint slides can be found here: Cardsorting Workflow.
The User Group will meet monthly, alternating days and times so that more people are able to join, even if they can only attend bi-monthly. Next presenter, July 11, will be Inga Schwabe, from the Department of Research Methodology, Measurement and Data Analysis. July 11, 1700 hrs, Weleweg 410, Boekelo.