We should pay special attention to writing a truly portable code that works in the same fashion under different locales and character encodings. Currently, R has two Regex engines, ERE (via TRE) and PRE (via PCRE). What is surprising, they…Read more › [Read more...]

This week version 0.8.3 of RAppArmor appeared on CRAN. RAppAmor is a package to dynamically enforce security policies and hardware restrictions in R on Linux systems. It currently supports Ubuntu 12.04+, Debian 7 and OpenSuse 12.1+. The readme page has more info, and helpful video tutorials to get you started. One important change in ... [Read more...]

Dale Barr (@datacmdr) recently had a nice blog post about coding categorical predictors, which reminded me to share my thoughts about multiple pairwise comparisons for categorical predictors in growth curve analysis. As Dale pointed out in his post, the R default is to treat the reference level of a factor ... [Read more...]

Ajay Ohri interviewed me on his popular DecisionStats blog. Topics discussed ranged widely from Fellows Statistics, to Deducer, to statnet, to Poker A.I., to Big Data.     [Read more...]

by Derek McCrae Norton, Senior Sales Engineer It is my job to help potential clients see that the tasks they are used to completing can be completed on big data in Revolution R Enterprise (and that it is easy). Honestly, this is my dream job, and in my eyes it ... [Read more...]

As Ive already written, getting data into R from your precious xlsx files is really handy. No need to clutter up your computer with txt or csv files. The previous post I wrote about the gdata package for importing data from xlsx files and was pointed to, among others, the ... [Read more...]

Just over a year or so ago, Mat Morrison/@mediaczar introduced me to a visualisation he’d been working on (How should Page Admins deal with Flame Wars?) that I started to refer to as an accession chart (Visualising Activity Around a Twitter Hashtag or Search Term Using R). The ... [Read more...]

This has been an exciting week for d3.js and R with the release of vega by the data vis powerhouses at Trifacta launch of clickme and already significant rewrite to accommodate vega inception of a very promising d3 templates DexCharts described in multiple posts. I am glad to have ... [Read more...]

My R package eeptools has reached version 0.2. As with the last release, this is still a preliminary release which means that functionality is not full, function names and code behavior may still change from version to version, and I am still looking f... [Read more...]

I was re-reading Michael Murray’s explanation of cointegration: and marvelling at the calculus. Calculus blows my mind sometimes. Like, hey guess how much we can do with subtraction. — protëa(@isomorphisms) March 28, 2013 Of course it’s not any subtraction. It’s subtracting a function from a shifted version of ... [Read more...]

Update 2015-11-09: This is migration from an old post. I took the SNA course by Lada Adamic in coursera. It’s a super interesting course. In fact, I was using the networks only how a visualization tool, and that is what it make me little bit embarrassing because there ... [Read more...]

I love networks! Nothing is better for visualizing complex multivariate relationships be it social, virtual or biological. I recently gave a hands-on network building tutorial using R and Cytoscape to build large biological networks. In these networks Nodes represent metabolites and edges can be many things, but I specifically focused ... [Read more...]

This week at the Davis R Users’ Group we had a great presentation by Kara Moore O’Leary on using the popbio package to examine rare plant demographics. The following is her script run through knitr. You can download the original script and associated data here. Find out more about ... [Read more...]

The new version of R was released yesterday. As I understand it, the numbering change to 3.0 represents the recognition that R had evolved enough to justify a new number rather than the addition of many new features. There are some important new featur... [Read more...]

by Joseph Rickert Life decisions are usually much too complicated to be attributed to any single cause, but one important reason that I am here at Revolution today is that I ignored suggestions from well-meaning faculty back in graduate school to work more in SAS rather than doing everything in ... [Read more...]

I frequently get asked to recommend workshops or online learning resources for bioinformatics, genomics, statistics, and programming. I compiled a list of both online learning resources and in-person workshops (preferentially highlighting those where workshop materials are freely available online):List of Bioinformatics Workshops and Training ResourcesI hope to keep the ... [Read more...]

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Adam Duncan, December 2012Also avilable on R-bloggers.com If you missed the first part of this analysis, be sure to check it out on gtog.github.com.In this part of the analyis, I’m going to look at the actual 1 day negative returns / VaR estimates (“VaR breaks”) across a ... [Read more...]

Recently, I need to construct an unique index from two integer. The best solution I found is the Pairing function. Pairing function is an one to one and onto function that map two integers to a single integer. The definition as follows: If ordering of x and y is not ... [Read more...]

We have a growing interest in using our favorite tools (R and Mathematica) to build web interfaces to interactively explore and visualize data. Our last 5 posts have involved interactive tools, namely Mathematica’s computable document format and R’s new Shiny package. There is a new kid on the block ... [Read more...]