A word cloud (or tag cloud) can be an handy tool when you need to highlight the most commonly cited words in a text using a quick visualization. Of course, you can use one of the several on-line services, such as wordle or tagxedo ,...

RStudio™ is an integrated development environment (IDE) for the statistical software R (www.r-project.org). It combines an intuitive user interface with powerful coding tools to help you get the most out of R. cloudnumbers.com provides researchers and companies with the access to resources to perform high performance calculations in the cloud. One often used application at cloudnumbers.com’s

Scrabble is a game that involves both skill and luck. There's skill in knowing the words you can play and — especially — the most advantageous ways to play them. But there's also luck in the tiles you draw randomly from the bag: get saddled with a rack containing four I's and there's usually not much you can do....

Sooner on later, every useR will manage to exhaust R’s built-in capabilities and land on CRAN looking for his dreamed needle in a haystack of 3k+ contributed packages. Probably most of you already know stuff like Task Views or rseek which make finding something relevant a bit easier than digging the full list or googling, however all methods

psych::pairs.panels and corrgram::corrgram using mtcars data Core Ideas: multivariate modeling is challenging pair plots make it easy to get a quick understanding of each variable and the relationships between them Multivariate analysis and modeling can be really challenging. Getting the job done well requires you to know your data really well. People often use the

Fast on the heels of getting RomanM’s code up and running in RghcnV3, Nick Stokes whipped out a version of his approach which he covered on his blog here: We exchanged code and few mails thrashing through details and I’m now in a position to start the integration work of his approach into Rghcnv3. In

"The R-Files" is an occasional series from Revolution Analytics, where we profile prominent members of the R Community. Name: Jeff Ryan Profession: Owner/Principal at Lemnica; Committee Member at R/Finance Nationality: American Years Using R: 8 Known for: R/Finance Conference, quantmod and xts packages Jeffrey Ryan is a Chicago-based quantitative software analyst and avid R user. He is perhaps best...

By Brian Kimball: http://code.google.com/p/sasquatch

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It is almost a year since CrossValidated was launched. Today we start a new activity at CrossValidated – a community blog. It is the fourth (after the main site, meta and chat) place for getting in touch with the community and contributing to it. To get started, we plan to post series of posts about the

The last Le Monde puzzle made me wonder about the ternary version of the sorting algorithms, which all seem to be binary (compare x and y, then…). The problem is, given (only) a blackbox procedure that returns the relative order of three arbitrary numbers, how many steps are necessary to sort a series of n

PC-Axis is a software family consisting of a number of programs for the Windows and Internet environment used to present statistical information. It is used by national and international institutions to publish statistical data. Programs in the PC-Axis family use a particular data file format (see the full PX-Axis data format description). Now the pxR

As a matter of convention, we usually run 3 or 4 chains in JAGS. By default, this gives rise to chains that draw samples from 3 or 4 distinct pseudorandom number generators. I didn’t go and check whether it does things 111,222,333 or 123,123,123, but in any event the “parallel chains” in JAGS are samples

Earlier this week, Conrad Sanderson issued a minor bug fix release 2.0.2 of his Armadillo library which provides templated C++ code for linear algebra. We wrapped that into a new RcppArmadillo release 0.2.26 and shipped it to CRAN. Due to it being su...

Argument passing via ... is a great feature of the R language, allowing you to write wrappers around existing functions that do not need to list all the arguments of the wrapped function. ... is used extensively in S3 methods and in passing graphical parameters on to graphical functions. When writing you own plot methods, using ... allows the...

Earlier this month Thomas Dinsmore, solutions architect for IBM Netezza’s Advanced Analytics team, had a great blog post on why companies should embrace R as an analytics platform. He says: There are three main reasons R should be part of your enterprise analytics architecture: R has capabilities not available in commercial analytics software Usage of R by analysts is...

R isn't just about serious things like model inference and prediction intervals and big analytics. Sometimes, R lets its hair down and just does weird and wonderful things because ... well just because. For example, with a package from Paulo Sonego, it can display your favourite XKCD cartoon: > install.packages("RXKCD", repos="http://R-Forge.R-project.org",type="source") > searchXKCD("support") num title 1 8 Red spiders...