Blog Archives

Visualizing car brand choices in ggplot2

June 2, 2012
By
Visualizing car brand choices in ggplot2

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 ...

Read more »

Cross-valitation variability example, part I

May 26, 2012
By
Cross-valitation variability example, part I

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 ...

Read more »

Emulating local static variables in R

May 17, 2012
By
Emulating local static variables in R

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...

Read more »

Porting cdplot to ggplot2

May 11, 2012
By
Porting cdplot to ggplot2

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...

Read more »

Visualizing tables in ggplot2

May 5, 2012
By
Visualizing tables in ggplot2

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...

Read more »

Animating Schelling’s segregation model

April 29, 2012
By
Animating Schelling’s segregation model

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...

Read more »

Generating all subsets of a set

April 20, 2012
By
Generating all subsets of a set

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...

Read more »

Plotting conditional densities

April 14, 2012
By
Plotting conditional densities

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...

Read more »

Comparing Banzhaf and Shapley-Shubik power indices

March 22, 2012
By
Comparing Banzhaf and Shapley-Shubik power indices

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)....

Read more »

Shapley-Shubik Power Index in R

March 13, 2012
By
Shapley-Shubik Power Index in R

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...

Read more »