# Monthly Archives: May 2013

## Veterinary Epidemiologic Research: Modelling Survival Data – Non-Parametric Analyses

May 23, 2013
By

Next topic from Veterinary Epidemiologic Research: chapter 19, modelling survival data. We start with non-parametric analyses where we make no assumptions about either the distribution of survival times or the functional form of the relationship between a predictor and survival. There are 3 non-parametric methods to describe time-to-event data: actuarial life tables, Kaplan-Meier method, and

## Generating a Markov chain vs. computing the transition matrix

May 23, 2013
By
$h\times h$

A couple of days ago, we had a quick chat on Karl Broman‘s blog, about snakes and ladders (see http://kbroman.wordpress.com/…) with Karl and Corey (see http://bayesianbiologist.com/….), and the use of Markov Chain. I do believe that this application is truly awesome: the example is understandable by anyone, and computations (almost any kind, from what we’ve tried) are easy to perform....

## The R-Podcast Episode 13: Interview with Yihui Xie

May 23, 2013
By

It’s an episode of firsts on the R-Podcast! In this episode recorded on location I had the honor and privilege of interviewing Yihui Xie, author of many innovative packages such as knitr and animation. Some of the topics we discussed include: Yihui’s motivation for creating knitr and some key new features How markdown plays a

## xkcd Style Bubble Plot

May 23, 2013
By

A package was recently released to generate plots in the style of xkcd using R. Being a big fan of the cartoon, I could not resist trying it out. So I set out to produce something like one of Hans Rosling’s bubble plots. First I needed some data. Spoilt for choice. I scraped some population data broken

## Vote in the KDnuggets poll on Analytics Software

May 22, 2013
By

The 14th annual KDnuggets poll measuring use of analytics software is open for voting. The poll asks, "What Predictive Analytics, Big Data, Data mining, Data Science software you used in the past 12 months for a real project?" and allows up to 20 choices from commercial software, open source software, and "big data" software. R was the leading choice...

## Big Data Analytics in R – the tORCH has been lit!

May 22, 2013
By

Normal 0 false false false EN-US X-NONE X-NONE ...

## How Important is Variable Selection?

May 22, 2013
By

Very. If you have 10 possible independent regressors, and none of which matter, you have a good chance to find at least one is important. A good chance being 40%: prob(one or more looks important) = 1 – prob(non looks … Continue reading →

## Operating on files with R: copy and rename

Nowadays, routinary operations on files, such as renaming or copying, are performed with some mouse clicks. Sometimes, it is useful perform this operations in batch. Linux users perform this operations through the shell. Also Windows users can use the shell, … Continue reading →

## What happened to six million voters?

May 22, 2013
By

The recent elections in Pakistan on May 11 were a great success by all means. In spite of the threats for violence by Al-Qaeda and its local franchises in Pakistan against those who would vote, millions of Pakistanis indeed stepped out to vote for an elected government. The Election Commission of Pakistan (ECP) claimed a voter turnout of 60%....