In my last post I have shown a solution to classical sorting problem in R. So I thought that this time it would be nice to generate a strategy for playing Mastermind using R.It was shown by D.E. Knuth that Mastermind code can be bro...
Blog Archives
Optimal sorting using rpart
Some time ago I read a nice post Solving easy problems the hard way where linear regression is used to solve an interesting puzzle. Following the idea I used rpart to find optimal decision tree sorting five elements.It is well known that...
You should not use split in production code
Recently I have stumbled on a problem with split function applied on list of factors. The issue is that it might produce wrong splits when splitting factors contain dots.Here is the example of the problem. Invoking the following code:df <-...
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 ...
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 ...
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...
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...
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...
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...
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...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
