R can be used also as a scripting tool. We just need to add shebang in the first line of a file (script):#!/usr/bin/Rscriptand then the R code should follow.Often we want to pass arguments to such a script, which can be collected in the script by ... [Read more...]

The apply function in R is a huge work-horse for me across many projects.  My usage of it is pretty stereotypical.  Usually, I use it to make aggregations of a targeted group of columns for every row in a dataframe. … Continue reading → [Read more...]

Like your .bashrc, .vimrc, or many other dotfiles you may have in your home directory, your .Rprofile is sourced every time you start an R session. On Mac and Linux, this file is usually located in ~/.Rprofile. On Windows it's buried somewhere in the R... [Read more...]

The useR!2013 conference in Albacete, Spain, will commence next Wednesday, 10 July, and on the day before Diego and I will give a googleVis tutorial. The following Monday, 15 July, the first R in Insurance event will take place at Cass Business School ... [Read more...]

Analyzing Likert scale responses really comes down to what you want to accomplish (e.g. Are you trying to provide a formal report with probabilities or are you trying to simply understand the data better). Sometimes a couple of graphs are sufficient and a formalize statistical test isn’t even ... [Read more...]

Diego Salmerón and Juan Antonio Cano from Murcia, Spain (check the movie linked to the above photograph!), kindly included me in their recent integral prior paper, even though I mainly provided (constructive) criticism. The paper has just been arXived. A few years ago (2008 to be precise), we wrote together ... [Read more...]

If you use R and ssh into other machines a lot, e.g. for doing some big data stuff on ec2, ess-remote is a great tool. Just use M-x ssh to ssh into the remote machine, then launch R. Now just M-x ess-remote and you can use the R process ... [Read more...]

R code for changing scale without changing mean or to make a probability distribution symmetric. These are commonly encountered problems by R programmers. We provide code for both of these tasks in the context of maximum entropy bootstrap (meboot) package in R. [Read more...]

Monday 1 July 2013 - 22:37 OpenAnalytics is once more proud sponsor of the yearly R User Conference and sent a strong delegation to present some of its recent work. On Tuesday July 9 Tobias Verbeke and Stephan Wahlbrink give a pre-conference... [Read more...]

The functions detailed inside the piece of code below (in a Gist) has been useful for me when I had to calculate many possible scenarios of statistical power and sample size. The formulae were taken from the article of Samuels … Sigue leyendo → [Read more...]

During our last webinar, we covered some of the basic ideas behind ggplot2, the R Visualization package by Dr. Hadley Wickham. In this blog post I will walk through the example that I covered during the webinar. In order to carry out the examples yourself, you may download the dummy ... [Read more...]

PostgreSQL and R can often be used together for data analysis - PostgreSQL as database engine and R as statistical tool. In this article you will learn how to access data stored in PostgreSQL database and how to write the data back using RPostgreSQL an... [Read more...]

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during his tenure as secretary of state, thomas jefferson oversaw the first american census way back in 1790.  some of my countrymen express pride that we're the oldest democracy, but my heart swells with the knowledge that we've got the world's o... [Read more...]