Time really flies… it is hard to believe that it has been over a month since my last post. Work and life in general have consumed much of my time lately and left little time for research and blog posts. Anyway, on to the post! This post will be the first in a series of … Continue reading...
A big thank-you to all the R users out there who voted for Revolution R Enterprise in DataWeek Awards. We're so pleased to be recognized by the voters and the DataWeek judging panel with the Top Innovator Award for Data Science Technology. We're looking forward to the awards ceremony next week at DataWeek SF (in San Francisco, September 24-27)....
Mebane Faber’s post Buffett’s Alpha points out Warren Buffett’s 0.76 Sharpe Ratio discussed in the similarly title paper Buffet’s Alpha. I of course immediately think about the 8th Wonder of the World – the US Bond Market, whose Sharpe ...
Ebola has also appeared in the Democratic Republic of the Congo. The WHO report from 21 August reports 15 cases and 10 deaths, mostly in the town of Isiro. This outbreak is in no way related to the Ugandan outbreak … Continue reading →
Logistic Regression is a popular and effective technique for modeling categorical outcomes as a function of both continuous and categorical variables. The question is: how robust is it? Or: how robust are the common implementations? (note: we are using robust in a more standard English sense of performs well for all inputs, not in the
Alan brought up the suspicion to Ye’s world record in women 400 metres individual medley. And I quote: “Her last split caused controversy (deep suspicion of doping) as she swam it faster than the fastest male swimmer. I wonder how commonly this … Continue reading →
One of the possible barriers to widespread adoption of open notebook science is knowing where to start. Video reports of lab experiments hosted on Youtube can be easily embedded in a hosted WordPress blog; a MediaWiki wiki can be used to provide one page per experiment, with change tracking/history on each page and a shadow 
It seems that most of the R-parallelizing business takes place on Linux clusters. And it makes sense. Why would you want to paralellize R on just a few processors (2 or 4) of a Windows laptop PC when the whole … Continue reading →
If you're writing C++ code and want to generate random numbers, you might not be aware that R provides an API to call the R RNG functionality directly. The Rcpp package's "syntactic sugar" feature makes this process easier, by automating the process of translating a subset of ordinary R code into compiled C++ code. That means you can write...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
