1266 search results for "tutorial"

2012 in review by The WordPress.com

December 30, 2012
By
2012 in review by The WordPress.com

Here is a 2012 annual report for this blog produced by The WordPress.com. My top post this year based on number of views are R-Uni (A List of Free R Tutorials and Resources in Universities webpages) 29 COMMENTS February 2012 R Style Guide 7 COMMENTS June 2012 Click here to see the complete report. Filed under: R

Read more »

Integration of R, RStudio and Hadoop in a VirtualBox Cloudera Demo VM on Mac OS X

December 29, 2012
By
Integration of R, RStudio and Hadoop in a VirtualBox Cloudera Demo VM on Mac OS X

MotivationI was inspired by Revolution's blog and step-by-step tutorial from Jeffrey Breen on the set up of a local virtual instance of Hadoop with R. However, this tutorial describes the implementation using VMware's application. One downside to using VMware is that it's not free. I know most of the people including me like to hear the words open-source and free,...

Read more »

Clustering with selected Principal Components

December 28, 2012
By
Clustering with selected Principal Components

In the Visualizing Principal Components post, I looked at the Principal Components of the companies in the Dow Jones Industrial Average index over 2012. Today, I want to show how we can use Principal Components to create Clusters (i.e. form groups of similar companies based on their distance from each other) Let’s start by loading

Read more »

MeRRy ChRistmas!

December 25, 2012
By
MeRRy ChRistmas!

Merry Christmas is.R() readers! Thanks for accompanying us through an excellent first semester of R blogging, and for your feedback and enthusiasm. To celebrate, we’ve built an image mosaic from the shiny, happy avatars of our over 600 (!) Twitter followers. Click for a beautiful mosaic! We’ll be back in 2013 with...

Read more »

The definitive guide to plotting confidence intervals in R

December 22, 2012
By
The definitive guide to plotting confidence intervals in R

Here at is.R(), we have produced countless posts that feature plots with confidence intervals, but apparently none of those are easy to find with Google. So, today, for the purposes of SEO, we’ve put “plotting confidence intervals” in the title of our post. We also cannot resist an earnest plea from our...

Read more »

Chocolate and nobel prize – a true story?

December 22, 2012
By
Chocolate and nobel prize – a true story?

Few of us can resist chocolate, but the real question is: should we even try to resist it? The image is CC by Tasumi1968. As a dark chocolate addict I was relieved to see Messerli's ecological study on chocolate consumption and the...

Read more »

Learn to use R for FREE with Coursera

December 21, 2012
By
Learn to use R for FREE with Coursera

Coursera is offering free courses about R among other interesting subjects. The first one on the application of R in financial econometrics is happening this week (but you can still enroll). There are two more courses starting in January 2013 are more about using R to analyse the data. The differences between the two are

Read more »

A simple web application using Rook

December 21, 2012
By
A simple web application using Rook

by Ben Ogorek I'm grateful to Rook for helping me, a simple statistician, learn a few fundamentals of web technology. For R web application development, there are increasingly polished methods available (most notably Shiny ), but you can build one...

Read more »

R Journal Volume 4, Issue 2

December 20, 2012
By

The latest issue of the bi-annual, peer-reviewed journal about R, the R Journal, is now available for download. This issue includes three articles on graphics from R-core member and R Graphics author Paul Murrell. He writes about accessing individual elements of an R chart by the component names, drawing complex symbols with the polypath function (useful for map icons,...

Read more »

How to select and merge R data frames with SQL

December 17, 2012
By

The R language provides many features in the language for selecting data from data frames: the "[" operator, logical functions, and utility functions like "subset". But if you know SQL (the query language ubiquitous in database systems), none of this is necessary. With the sqldf package, you can just pretend that your data frame is a database, and use...

Read more »