As mentioned in this post, I have been using the powerful combination of the Beautiful Soup and Mechanize modules in Python to build a web scrapers. The amount of data on the web is amazing, and I believe that any quantitatively oriented social scienti...
Hier soir, j’évoquais l’utilisation des chaînes de Markov au jeu Serpents et Échelles. Comme me le faisait remarquer Jean-Philippe, de manière assez étrange, les enfants sont toujours beaucoup plus content après avoir fait un 6 qu’après avoir fait un 1. Mais est-ce réellement la valeur optimale que le dé doit prendre ? Ça dépend bien sûr de la position....
After a small frustration with the limitations of R 16-bit intergers. I think i have worked out a solution. The issue was i was implementing a bone-headed solution to the modulo/exponent step. So to recap. The Lehmann primality test is a probabilistic ...
I wrote a little function to make a personalized map of who follows you or who you follow on Twitter. The idea for this function was inspired by some plots I discussed in a previous post. I also found a lot of really useful code over at flowing data he...
Another set of stepping stones that provide a clunky route to a solution that @mhawksey has been working on a far more elegant expression of (eg Free the tweets! Export TwapperKeeper archives using Google Spreadsheet and Twitter: How to archive event hashtags and create an interactive visualization of the conversation)… The recipe is as follows: 
In the last post, we discussed the issue of finding the market portfolio by fitting a curve to the found efficient frontier. Because of kinks in the frontier, we could not guarantee that the fitted curve would be concave in the area of the market...
I mistakenly assume everyone knows that US Treasury Returns have been extreme in 2011. As we near the end of the year, I thought it would be beneficial to look at the world’s best performer while incorporating some new graphical techniques.&nbs...
I came across an interesting SAS macro that was used for visualizing log odds relationships of data. This type of chart is helpful for visualizing the relationship between a binary dependent variable and a continuous independent variable. I...
![The ‘R’ in Human [R]esources (or: a very brief introduction to the statistical package ‘R’ for HR)](http://holtmeier.de/wp/wp-content/uploads/2011/12/rstudio.png)
I studied psychology in Marburg (Germany). At university we exclusively used SPSS. The courses were among my classmates usually not the most popular. After over 10 years in management consulting, I have noticed that little has changed to this. It’s a shame because a lot of interesting data in consulting firms and HR departments remain unused. In my role as managing director of kibit GmbH, I have placed the focus of the company on ”R” … Weiterlesen →
With R, it is extremely easy to draw maps. Let us start with something simple, like French regions. Baptiste mentioned on his blog that shapefiles can be downloaded from http://ign.fr/ website. Hence, if you extract the zip file, it is possible to ...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
