Tcl/Tk GUI Example with Variable Input by User

August 11, 2012
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Tcl/Tk GUI Example with Variable Input by User

I recently used R with GUI-elements for the first time and browsed through the available online resources, but I didn't quite find what I was searching for: The user should be able to put in some variables and call a function with a button. In the end ...

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Universal portfolio, part 10

August 10, 2012
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Universal portfolio, part 10

Part 9 compared the wealth of Universal against other portfolio selection algorithms by using the experimental cumulative distribution function of the relative wealth.  This leads to a very compact representation, but it completely hides the ...

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RcppExamples 0.1.4

August 10, 2012
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An updated version 0.1.4 of the RcppExamples package is now on on CRAN. RcppExamples contains a few illustrations of how to use Rcpp. The NEWS entry is below: a new example was added illustrating use of the (vectorised) random-number generators...

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Animated GIF Annual Correlation of 48 Industries for 50 Years

August 10, 2012
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Animated GIF Annual Correlation of 48 Industries for 50 Years

Inspired by http://blogs.reuters.com/felix-salmon/2012/08/06/chart-of-the-day-hft-edition/, I thought I would build on 48 Industries (Dendrogram Ordered) Over 50 Years, “Trend is Not Your Friend” Applied to 48 Industries, and 48 Industries Since 19...

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In case you missed it: July 2012 Roundup

August 10, 2012
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In case you missed them, here are some articles from June of particular interest to R users. The Environmental Performance Index website uses R to rank countries by measures like environmental health and ecosystem vitality. A log-linear regression in R predicted the gold-winning Olympic 100m sprint time to be 9.68 seconds (it was actually 9.63 seconds). Some R-related talks...

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Trends in run scoring – comparing the leagues

August 10, 2012
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My previous two posts have looked a using R to create trend lines for the run scoring environments in the American and National leagues.  This time around, I'll plot the two against each other to allow for some comparisons. (The code below assumes that you've read the data into your workspace and calculated the LOESS...

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RStudio server through ssh

August 10, 2012
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R language has numerous IDEs – RStudio, Vim plugin, Eclipse plugin. RStudio really shines for R language, nevertheless Vim plugin might be well adapted for R if you are Vim guru. Eclipse? Who needs such behemoth? Turns out a student in Ljubljana badly needs it. Most of the time I use remote server for R

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Why we are teaching massive open online courses (MOOCs) in R/statistics for Coursera

August 10, 2012
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Editor’s Note: This post written by Roger Peng and Jeff Leek.  A couple of weeks ago, we announced that we would be teaching free courses in Computing for Data Analysis and Data Analysis on the Coursera platform. At the same time, a number of ot...

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Simulation: The modeller’s laboratory

August 10, 2012
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Simulation: The modeller’s laboratory

In his 2004 paper in Trends in Ecology and Evolution, Steven Peck argues: Simulation models can be used to mimic complex systems, but unlike nature, can be manipulated in ways that would be impossible, too costly or unethical to do in natural systems. Simulation can add to theory development and testing, can offer hypotheses about the

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Importing data directly from MS Excel

August 10, 2012
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Importing data directly from MS Excel

R is great for exploring, analysing and graphing your valuable data. No question about it. Unfortunately though, there’s no base package support for importing data directly from MS Excel. This means that you have to faff about saving it in another format, and THEN import this new file. This just adds another file to your

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Brokering Closure is moving

August 10, 2012
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Brokering Closure is moving

Dear readers, this blog is moving out from wordpress.com to a new location. The new address is http://bc.bojanorama.pl. Please update your bookmarks. Drodzy czytelnicy, blog “Brokering Closure” wyprowadza się z wordpress.com pod nowy adres: http://bc.bojanorama.pl. Zaktualizujcie swoje linki/zakładki. Filed under: game theory, geek, networks, po polsku, R, social science, statistics, Uncategorized, web

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RProtoBuf 0.2.5

August 9, 2012
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A new release 0.2.5 of RProtoBuf is now on CRAN. RProtoBuf provides GNU R bindings for the Google Protobuf data encoding library used and released by Google. This release once again contains a number of patches kindly contributed by Murray Stokely...

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Installing the Development Version of R on Ubuntu (alongside the current version of R)

August 9, 2012
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A recent question was asked on the R-sig-Debian on installing the development version of R alongside the stable version. While most users of R do not need to have two versions installed on their machine, it is useful if you are developing packages for...

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48 Industries (Dendrogram Ordered) Over 50 Years

August 9, 2012
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48 Industries (Dendrogram Ordered) Over 50 Years

Thanks to reader AHWest for the comment on post 48 Industries Since 1963. “I think it would be interesting to see the industries ordered by some sort of similarity of returns.” I think this is a great suggestion, and I would like to see it also.&n...

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2012 Summer Olympics: Home Court Advantage – How Will the Brits Perform?

August 9, 2012
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2012 Summer Olympics: Home Court Advantage – How Will the Brits Perform?

The Olympics are a big deal on a global scale. How big? Perhaps Paula Radcliffe (an English long distance runner) said it best: "I have achieved a lot and I'm grateful for that - I'm just a bit greedy because I want to add the Olympics. It's...

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How Many Data Scientists Are There?

August 9, 2012
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How Many Data Scientists Are There?

How Many Data Scientists Are There? I've seen a lot of articles lately about “Big Data” and the looming “talent gap.” This article from the Wall Street Journal is a good example. It cites a McKinsey estimate that states that we will need 1.5 million more managers and analysts who are conversant with “big data.” Of...

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How Many Data Scientists Are There?

August 9, 2012
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How Many Data Scientists Are There?

How Many Data Scientists Are There?I've seen a lot of articles lately about “Big Data” and the looming “talent gap.” This article from the Wall Street Journal is a good example. It cites a McKinsey estimate that states that we will need 1.5 million more managers and analysts who are conversant with “big data.” Of...

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Cheat sheet for prediction and classification models in R

August 9, 2012
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Cheat sheet for prediction and classification models in R

Ricky Ho has created a reference a 6-page PDF reference card on Big Data Machine Learning, with examples implemented in the R language. (A free registration to DZone Refcardz is required to download the PDF.) The examples cover: Predictive modeling overview (how to set up test and training sets in R) Linear regression (using lm) Logistic regression (using glm)...

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The Relative Importance of Predictors – Let the Games Begin!

August 9, 2012
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The Relative Importance of Predictors – Let the Games Begin!

What's the one thing we need to do?Marketing researchers are asked this question frequently whenever they analyze customer satisfaction data.  A company wishing to increase sales or limit churn wants to focus only on the most important determinants of those outcomes.   Given the limitations imposed by the available customer survey data, this strategic question is transformed quickly into a methodological one concerning how...

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How Many Data Scientists Are There?

August 9, 2012
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How Many Data Scientists Are There?

How Many Data Scientists Are There? I've seen a lot of articles lately about “Big Data” and the looming “talent gap.” This article from the Wall Street Journal is a good example. It cites a McKinsey estimate that states that we will need 1.5 million more managers and analysts who are conversant with “big data.” Of course, some of this is the media...

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Exploring distributions of Ensatina salamander subspecies using rvertnet by Neil Kelly

August 9, 2012
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Exploring distributions of Ensatina salamander subspecies using rvertnet by Neil Kelly

This week we have a guest blog post by Neil Kelley Last week, I stumbled on Vijay’s blog post demonstrating his new package rvertnet. Although I am a paleontologist, some of my research involves anatomical comparison between extinct species and extant relatives or ecological analogs, so I have some experience using VertNet to track down

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Exploring distributions of Ensatina salamander subspecies using rvertnet by Neil Kelly

August 9, 2012
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Exploring distributions of Ensatina salamander subspecies using rvertnet by Neil Kelly

This week we have a guest blog post by Neil Kelley Last week, I stumbled on Vijay’s blog post demonstrating his new package rvertnet. Although I am a paleontologist, some of my research involves anatomical comparison between extinct species and extant relatives or ecological analogs, so I have some experience using VertNet to track down

Read more »

How Many Data Scientists Are There?

August 9, 2012
By
How Many Data Scientists Are There?

How Many Data Scientists Are There? I've seen a lot of articles lately about “Big Data” and the looming “talent gap.” This article from the Wall Street Journal is a good example. It cites a McKinsey estimate that states that we will need 1.5 million more managers and analysts who are conversant with “big data.” Of course, some of...

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Interviews

August 9, 2012
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I’ve been interviewed twice in the last year: For DecisionStats, 9 August 2012. For Data Mining Research, 21 October 2011. Republished in Amstat News, 1 December 2011. Some readers of this blog might find them interesting. I said a few things in t...

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Show me yours and I’ll show you mine

August 9, 2012
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Show me yours and I’ll show you mine

I remember when I started with R, there was little processing power directed toward an IDE. I had enough problems with the syntax, loops and the like and R gui seemed adequate. When I started working on a heavy project, I had to knock it up a notch (bam!). After weeks of trial and error

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Minimum Expected Shortfall Portfolio, Part 1

August 8, 2012
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A few days ago, I wrote a piece on finding the minimum expected shortfall portfolio.  A few astute commenters quickly picked up where I was going with this -- using this as an alternative to low/minimum volatility portfolios.  What follo...

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RcppBDT 0.2.1

August 8, 2012
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A new bug-fix release of the RcppBDT package appeared on CRAN earlier today. David Reiner noticed that the functions getEndOfMonth and getEndOfBizWeek were not working right. These are convenience wrappers around the real functionality provided as a ...

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The top 10 critical packages on CRAN

August 8, 2012
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The top 10 critical packages on CRAN

While most R packages on CRAN are designed to be used by an R user directly, a few packages are designed to be used by other package developers. (And some packages are so useful that they're regularly used by both camps.) When a package author publishes a package to CRAN, she must list those packages that provide functions her...

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“Trend is Not Your Friend” Applied to 48 Industries

August 8, 2012
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“Trend is Not Your Friend” Applied to 48 Industries

Please see previous post Crazy RUT in Academic Context Why Trend is Not Your Friend. I’ll repeat the intro to the post mentioned above, so we can all get caught back up. In response to Where are the Fat Tails?, reader vonjd very helpfully referred me...

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