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Blog Archives
Data analysis class
I've been writing software to help others do data analysis for a number of years and at the same time trying to work up my nerve to try my own analysis. Why let other people have all the fun? So, when I saw that Jeffrey Leek, biostatistician at Johns Hopkins and coauthor of Simply Statistics, was teaching...
R in the Cloud
I've been having some great fun parallelizing R code on Amazon's cloud. Now that things are chugging away nicely, it's time to document my foibles so I can remember not to fall into the same pits of despair again.
The goal was to perform lots of trails of a randomized statistical simulation. The jobs were independent and fairly chunky, taking...
Feature selection and linear modeling
(This article was first published on Digithead's Lab Notebook, and kindly contributed to R-bloggers) To leave a comment for the author, please follow the link and comment on his blog: Digithead's Lab Notebook. R-bloggers.com offers daily e-mail updates about R news and tutorials on topics such as: visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL, Eclipse, git,...
Computing kook density in R
Do you ever see strange lights in the sky? Do you wonder what really goes on in Area 51? Would you like to use your R hacking skills to get to the bottom of the whole UFO conspiracy? Of course, you would! UFO data from infochimps is the focus of a dat...
OO in R
"Is there a package for obfuscating code in #rstats?", someone asked. "The S4 object system?!" came the snarky reply. If you're smiling right now, you know that it wouldn't be funny if it weren't at least a little bit true.
Options: S3, S4 or R5?
There can be little doubt that object oriented...
Linear regression by gradient descent
In Andrew Ng's Machine Learning class, the first section demonstrates gradient descent by using it on a familiar problem, that of fitting a linear function to data.
Let's start off, by generating some bogus data with known characteristics. Let's make y just a noisy version of x. Let's also add 3 to give the intercept term something to...
Long-vector kludge in R
Just recently, I found out that R is limited to 32-bit integers, even on 64-bit hardware. Bummer, huh? As a consequence, the maximum size of a vector is 2^31-1. To be fair, dealing with numeric types across machine architectures is hard. A fixed repr...
Sage Bionetworks Synapse
Michael Kellen, Director of Technology at Sage Bionetworks, is trying to build a GitHub for science. It's called Synapse and Kellen described it in a talk at the Sage Bionetworks Commons Congress 2012, this past weekend: 'Synapse' Pilot for Building an...
International Open Data Hackathon
This past Saturday, I hung out at the Seattle branch of the International Open Data Hackathon. The event was hosted at the Pioneer Square office of Socrata, a small company that helps governments provide public open data.
A pair of data analysts from Tableau were showing off a visualization for the Washington...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
