November 2012

Picking Lotto Numbers

November 28, 2012 | Jared Knowles

There's not a lot you can do to increase your odds of winning the lottery tonight. With the PowerBall at $500 million though, a lot of otherwise rational folks might be tempted into playing. For those of you newly tempted, it is important to remember a... [Read more...]

Distribution of uptimes for high-performance computing systems

November 28, 2012 | Derek Jones

Computers break down every now and again and this is a serious problem when an application needs runs on thousands of individual computers (nodes) plugged together; lots more hardware creates lots more opportunity for a failure that renders any subsequent calculations by working nodes possible wrong. The solution is checkpointing; ... [Read more...]

Images as Voronoi tesselations

November 28, 2012 | is.R()

This is probably the coolest-looking thing I’ve figured out how to do with raster images in R. Similar to (although not quite as impressive as) these images by Jeff Clark, I alter the simple k-means approach described in the previous post to... [Read more...]

What Time Is It?

November 28, 2012 | Wesley

A common scenario that I run into is time and how to deal with it. I often will do a  variety of summaries and analysis that need to be measured at different points in time. Whether I want to graph the data or review the results I need to be ... [Read more...]

Quick Shiny Demo – Exploring NHS Winter Sit Rep Data

November 28, 2012 | Tony Hirst

Having spent a chink of the weekend and a piece of yesterday trying to pull NHS Winter sitrep data into some sort of shape in Scraperwiki, (described, in part, here: When Machine Readable Data Still Causes “Issues” – Wrangling Dates…), I couldn’t but help myself last night and had a ... [Read more...]

Why [Not] Simulate?

November 27, 2012 | Daniel

Since we are in the “big data” Era, which means that a massive amount of data are made daily available by governments, institutions, and ordinary people like you and me—the importance of simulate data for “frequentists”, like myself, seems to fade. After all, once we have access to “real ... [Read more...]

I give up, I am embracing pie charts

November 27, 2012 | Rafael Irizarry

Most statisticians know that pie charts are a terrible way to plot percentages. You can find explanations here, here, and here as well as the R help file for the pie function which states: Pie charts are a very bad … Continue reading → [Read more...]

Using R in the Human Resources department

November 27, 2012 | David Smith

Ajay Ohri, author of R for Business Analytics, was recently interviewed about using R instead of Excel for human resources management. Human Resources is an increasingly analytics-driven field, with predictive modeling now used to prioritize applicants for interview and to organize workspaces, to give just two examples. As Ajay points ... [Read more...]

Rcpp 0.10.1

November 27, 2012 | Thinking inside the box

A the new Rcpp release 0.10.1 arrived this morning on CRAN (as already has Windows binaries) and in Debian. This is a follow-up to the recent 0.10.0 release which extends the exciting new Rcpp-attributes and Rcpp-sugar work further, and as in a n... [Read more...]

MCMC convergence assessment

November 27, 2012 | xi'an

Richard Everitt tweetted yesterday about a recent publication in JCGS by Rajib Paul, Steve MacEachern and Mark Berliner on convergence assessment via stratification. (The paper is free-access.) Since this is another clear interest of mine’s, I had a look at the paper in the train to Besançon. (And ... [Read more...]

Triples, stores, and SPARQL in R

November 27, 2012 | Egon Willighagen

For some time I have been stealing an hour here and there for the rrdf package for R. This package is based on Apache Jena and allows reading and writing of RDF triples, as well as doing local and remote SPARQL querying. BTW, rrdf is not only R pa... [Read more...]

"Dominant" Color Palettes with k-means

November 27, 2012 | is.R()

The idea of deriving color palettes from images has long been an interest of mine. There are places you can do this online, but it’s at least plausible that you might want to identify dominant colors programatically, for a large number of image... [Read more...]

2012-10 Introducing the ‘selectr’ Package

November 26, 2012 | akoh003

The selectr package translates a CSS selector into an equivalent XPath expression. This allows the use of CSS selectors to query XML documents using the XML package. Convenience functions are also provided to mimic functionality present in modern web browsers. … Continue reading → [Read more...]

Image Manipulation in R, Part 1

November 26, 2012 | is.R()

So, you know how to load PNG files, access their innards, and plot them as points in a scatter plot. But, is it possible to use R to do some of the awesome things you can do with Mathematica? Well, in this series of posts, I’ll introduce just ... [Read more...]
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