"Open source software packages like WordPress and Firefox have been major influences on modern computing. In statistics, open source software known as “R” has become the most popular environment for statistical computation and data analysis. A recent paper in PNAS studied the developers who make this software so successful to understand what motivates them and why they find contributing satisfying." -- source: http://arstechnica.com/science/2015/11/open-source-projects-rely-on-donated-... Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, NZ +64 (7) 858-5174 http://www.cms.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/