Research Methodology Blog
Here you can find information concerning empirical software engineering, experimentation, statistics etc.
Box and whisker plots
Box plots are valuable way of visualizing experimental data. They can be used to present central tendency and approximation of the sample distribution.
The R Project for Statistical Computing
If you conduct empirical studies you have to analyze your data. In many cases applications like MS Excel or Open Office Spreadsheet are enough, but sooner or later you get to the point when you need a professional statistics package. If you don't have access to commercial tools like Statistica, MATLAB or S-PLUS, the R package might be the best choice for you ...