A famous finance professor once told us that good diversification meant holding everything in the world. Fine, but in what proportion? Suppose you could invest in every country in the world. How much would you invest in each? In a market-capitalization weighted index, you'd invest in each country in proportion to the market value of...
![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 →
It is not uncommon to have two computers at work, four at home and a server out on the wild, wild internet (that's what we have, anyway ... wait, we forgot one in London). How to keep all these files in sync? Here are our file synchronization tips.
In creating the numbers tool I wanted to be able to do two things, 1) obtain information about what source did by matching the numeric literals it contained against a database of ‘interesting’ values (now with over 14,000 entries) and 2) flag possible incorrect numeric literals (e.g., 3.1459265 when 3.14159265 had been intended in...
Yesterday Alasdair Allan and Pete Warden shocked the world by revealing that iPhones and iPads have been keeping track of our every move, and saving the data in obfuscated back up files. As my friend Vince Buffalo mentioned on Twitter, part of me was disgusted by the secret stalking Steve Jobs was doing,...
Like many people who crunch numbers frequently, I have increasingly been integrating Amazon’s cloud computing services into my daily workflow. In particular, I have been using their elastic cloud computing (EC2) on a regular basis. The service is an excellent way to offload computationally intensive work from your laptop for literally pennies...
The gap of the new “digital divide” between those who only use computers when they are as easy to use as iPads and smartphones and those who like (or at least accept) to type commands to perform jobs, seems to get bigger and bigger. R – the lingua franca of statistical computing – is...
Recently, the good folks at Infochimps.com rolled out a series of new APIs to add to their already impressive set of data resources.
I have been in a perpetual state of catch-up since the new year, so I have only now got around to adding some of these new APIs to the infochimps R package....
The housing bubble by city. Miami sailed high and fell far. Detroit rose modestly and but dropped more than it went up. Dallas held steady. DC is enjoying a bit of renewed growth, but are in and New York yet to fall?
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
