After having a look to this video: http://www.screenr.com/UxH8 from rtwotutorials, and reading some tutorials, I decided to modified the script from the previous post: Practicing Script with “ R”: Monitor , in order to make it more r...
Monthly Archives: May 2012
I’ve Converted to R Full-Time
It's been over four years that I've been using both R and Stata, but as of last week I've become an R convert. For several years I had conducted statistical analyses in R (since many complex models can only be programmed in R), but I used Stata before ...
reshape (from base) Explained: Part II
Part II Explains More Complex Wide to Long With base reshape In part I of this base reshape tutorial we went over the basics of reshaping data with reshape. We learned two rules that help us to be more efficient … Continue reading →
RcppArmadillo 0.3.0.3
Two days ago, Conrad Sanderson released another bug-fix version 3.0.3 for the 3.0.0 branch of his excellent Armadillo C++ template library for linear algebra. The new RcppArmadillo release 0.3.0.3 which contains it appeared on CRAN yesterday. Beside ...
Making an Animated Heart GIF in R
Messing around with animations, I created this toy example to make a growing outline of a heart in R. I have put it up as a gist on GitHub and embedded it below. It uses the animation and the ggplot2 packages--both of which make it incredibly simple to...
What’s Up with Albert Pujols?
After signing a huge deal with the Angels, Pujols has been having a really bad year. He hasn't hit a home run this year, breaking a career long streak. So I thought it would be a good idea to use some statistics to tell how good or bad we think Pujols will actually be this year.
Coming into the year,...
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...
Compiling R code, and speed up your computation
I just ran into this interesting post on the R-bloggers Planet. The described R functionality allows you to compile R code (to byte code) so that it will no longer be interpreted but actually run. That is a performance boost. I guess in due time we will see R use JIT technologies, so that the difference will...
Kaplan-Meier Survival plot – with at risk table, by sub groups
This is a follow on from the previous post, with updated code. There was an argument ‘groups’ in the ggplot(…) line of the code that was working but is now no longer working with the updated version of R/ggplot2 (I … Continue reading →
Correlations, dimension, and risk measure
Yesterday, while I was attending the IFM2 conference, at HEC Montreal, I heard a nice talk about credit risk, and a comparison between contagion (or at least default correlation), for corporate and retail companies (in the US). And it was mentioned...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
