When Google introduced Google Instant (where search results are displayed as you type), it was certainly a boon for searchers. Personally, I've started visiting the Google homepage after years of just using the search box in Firefox (and now Chrome), and enjoying the improved search experience. (And I get to ... [Read more...]

What a headline.. It's about combining boolean vectors in R. [Read more...]

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Saptarshi Guha, who we profiled yesterday, is at the Hadoop World conference in New York City today. At 4PM, Saptarshi will give a presentation on RHIPE, his link between R and Hadoop. Saptarashi was interviewed yesterday by Alex Handy of the SD Times, where he talked about his background and ... [Read more...]

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We often use Gnu R to work on different things and to solve various exercises. It's always a disgusting job to export e.g. a matrix with probabilities to a LaTeX document to send it to our supervisors, but Rumpel just gave me a little hint. [Read more...]

It is very common to cluster genes based on their expression profiles, and also very common to integrate Gene Ontology to observe the distribution of biological processes, molecular functions and cellular components for a given gene list. But, what if the two in combination? The Gene Ontology distributions across a ... [Read more...]

It's the Monday of the Columbus Day weekend here, so I must have been running a Chicago Marathon yesterday. Indeed -- the 34th annual Chicago Marathon took place yesterday but everything was about its 10/10/10 date. The symmetric set of numbers was i... [Read more...]

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"The R-Files" is an occasional series from Revolution Analytics, where we profile prominent members of the R Community. Name: Saptarshi Guha Background: Ph.D. in Statistics, Purdue University Nationality: India Years Using R: 6 Known for: Developing RHIPE package for R + Hadoop integration At just 31 years old, Saptarshi Guha has emerged ... [Read more...]

Testing the omnibus hypothesis via one-way ANOVA is simple process in R. This tutorial will explore how R can be used to perform a one-way ANOVA to test the difference between two (or more) group means. Tutorial FilesBefore we begin, you may want to do... [Read more...]

Canadian R user Leo Guelman contacted me last week to ask if there was an R User Group in Toronto. There wasn't one last week, but there's one now: Leo has taken the initiative to start a new useR group. The Greater Toronto Area (GTA) R User's Group is now ... [Read more...]

Recently ICC awards 2010 were announced and I began wondering how the process works. I haven't seen any good documentation of the process, so I started thinking  how would I do it. Here's my version. Thoughts?Note: I is impossible to det... [Read more...]

About 10 months ago, I was looking for a plugin to enable me to highlight R code on my self hosted WordPress blog. The solution I came up with then was to use the wp-syntax plugin (with the need for some modifications). Today I was informed of (what I believe is) ... [Read more...]

Tal Galili’s blog post mentioned that WP-Syntax can highlight R codes. I downloaded the modified version of WP-Syntax in his blog site. The plugin throw an error when activated. I did not try the original version hosted in Wordpress. I found that WP-CodeBox use GeShi for syntax highlighting as ... [Read more...]

Update: Some are not aware that GISS has switched to using Nightlights in the ROW. According to their updates they have moved to nightlights for the ROW. The station inventories can be found here The station I examine below is listed  like this in the new giss inventory 20551495001 TURPAN 42.92 91.00 24 384R ... [Read more...]

The puzzle in Le Monde this week[end] is called the “square five” (sic!): Two players each have twenty-five cards with five times each of the digits 1,2,3,4,5. They alternate putting one card on top of the pile, except that they can instead take an arbitrary number of consecutive cards from ... [Read more...]

At midnight this morning, Kaggle began accepting submissions for the data hacking contest that we announced on Thursday. Hopefully you’ve used the last few days to build predictions for the test data set. Once you submit your predictions, you’ll be able to see your position on the leaderboard. ... [Read more...]

The R Recommendation Engine contest is now live on Kaggle. Please head over there and start submitting your predictions for the test data set. Once you do, you can check the leaderboard to see how your algorithm compares with other people’s work. We know that there’s still plenty ... [Read more...]