I always like to read new posts at chartsnthings as they always inspire me with new ideas for data visualization. Yesterday I have read an article on choices of car brands by members of parliament in Poland in Gazeta.pl. It contains a simple ...

Recently I had a discussion with a student about variability of results obtained from cross-validation procedure. While the subject is well known there are not many examples on the web showing it, so I have written its simple presentation.Results from ...

Recently I was writing a code allowing to plot multiple ggplot2 plots on one page. I wanted to replicate standard behavior of plot function that plots graphs in sequence according to mfrow/ mfcol option in par...

Last week I published a post on plotting tables in ggplot2. So the next natural step is to port cdplot to allow simple visualization of categorical variables against a numerical predictor.First part of the story covers binary variables. In th...

Recently I wanted to recreate assocplot using ggplot2. In the end I propose a simple way to visualize data arranged two-way tables using geom_tile.I used Titanic data set as an example combining age and sex dimensi...

Recent blog post on Animations in R inspired me to write a code that generates animations of simulation model. For this task I have chosen Schelling's segregation model.Having written the code I have found that one year ago a similar code has been...

Recently I have calculated Banzhaf power index. I required generation of all subsets of a given set. The code given there was a bit complex and I have decided to write a simple function calculating it. As an example of its application I reproduce Figur...

Recently I have read a post on Comparing all quantiles of two distributions simultaneously on R-bloggers. In the post author plots two conditional density plots on one graph. I often use such a plot to visualize conditional densities of score...

Last week I analyzed Shapley-Shubik power index in R. I got several requests to write a code calculating Banzhaf power index. Here is the proposed code.Again I use data from Warsaw School of Economics rector elections (the details are in my last post)....

This spring we have Rector Elections at Warsaw School of Economics. One of my collegues Tomasz Szapiro agreed to start in the elections. This induced me to write Shapley-Shubik Power Index calculation snippet in R.Rector elections in Warsaw School...