Identify 2/3 vacation photos, win \$5 Starbucks gift card

March 29, 2013
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I have a \$5 Starbucks gift card that I simply can't remember to use; I've had it since Christmas. So, I will mail it (within the U.S.A.) to the first commenter who can identify the longitude/latitude (within 5km) where two of these three vacation photos were taken (photos below). ***Update 3/30/2013: locations A and C

R/Finance 2013 Registration Open

March 29, 2013
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The registration for R/Finance 2013 -- which will take place May 17 and 18 in Chicago -- is NOW OPEN!Building on the success of the previous conferences in 2009, 2010, 2011 and 2012, we expect more than 250 attendees from around the world. R users from...

Facebook profile photo changes reveal trends in support for same-sex marriage

March 29, 2013
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On Tuesday and Wednesday this week, the US Supreme Court heard two landmark cases related to same-sex marriage rights in this country. Simultaneously, to show solidarity for the cause of civil rights for gay members of society, thousands of Facebook users changed their profile pictures to a red equality symbol at the suggestion of the Human Rights Campaign. Most...

R on Android

March 29, 2013
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In Riyadh I spent a rainy afternoon trying to work out how this was done (no, not really rainy but stayed indoors instead of driving about the desert). There's not much on the web about it. For at least a year people have been saying there will be an app - and yes, one will eventually appear, but for now...

R / Finance 2013 Open for Registration

March 29, 2013
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The annoucement below just went to the R-SIG-Finance list. More information is as usual at the R / Finance page: Now open for registrations: R / Finance 2013: Applied Finance with R May 17 and 18, 2013 Chicago, IL, USA The registration for R/Fin...

Julia builds for Ubuntu precise/quantal

March 29, 2013
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I wanted to play a bit Julia, the new language for technical computing, but no binaries were available yet for current versions of Ubuntu. So I decided to try and build them myself by backporting the julia 1.2.0 source package available in Sid and Raring. On Quantal, the packages were building out of the box. ...

Open Data Exchange 2013, April 6. Montreal

March 29, 2013
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UPDATE: The day was great! There are many people doing really amazing things with open data and it was amazing to meet them. Here are my slides from the panel talk. Next Saturday, I’ll be sitting on a panel discussing future avenues for open data at ODX13. From the odx13 site: Odx13 is a mini-conference

latent Gaussian model workshop in Reykjavik

March 28, 2013
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An announcement for an Icelandic meeting next September, meeting I would have loved to attend (darn!)… This meeting is sponsored by the BayesComp session, of course!!! We are pleased to announce that the University of Iceland will host the 3rd Workshop on Bayesian Inference for Latent Gaussian Models with Applications (LGM). The workshop will be

The apply function in R

March 28, 2013
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So as discussed in this post I will be investigating the different members of the 'apply function family' in R. This post starts with the most basic one, called apply(). The R manual states the following apply(X, MARGIN, FUN, ...) With the following arguments X an array, including a matrix. MARGIN a vector giving the subscripts which

Moving up in the ranks: from an R-Rookie to an R-Pro

March 28, 2013
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I am playing with R now for little over a year. Not very intensive, but once in a while I start up R Studio and do some coding and analysis. But I am still far, far away from becoming an R-Pro. If you talk to or read some of the posts of the more seaso...

Swimming in a sea of code

March 28, 2013
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If you are looking for code here, move on. > In the beginning, there was only the relentless blinking of the cursor. With the maddening regularity of waves splashing on the shore: blink, blink, blink, blink…Beyond the cursor, the white wasteland … Continue reading →

March 28, 2013
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Creating a Business Dashboard in R

March 28, 2013
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Business dashboards are available in many shapes and sizes. Business dashboards are useful to create an overview of key performance indicators (KPIs) important for the business strategy and/or operations. There are many flavours of dashboard frameworks and apps available, ranging in price from thousands of dollars to open-source implementations. Apparently  Read more »

Data visualization with R and ggplot2

March 28, 2013
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I’m working on a one-hour ggplot2 lecture for the San Diego R users group, which I will post here when I’m done. I think there are many great intro to R data visualization resources out there so I’ll only share working examples on my blog. A retail chain client employs a few hundred field agents who perform

Generalized Pairs Plot: It’s about time!

March 28, 2013
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JW Emerson, WA Green, B Schloerke, J Crowley, D Cook, H Hofmann, H Wickham (2013) The Generalized Pairs Plot. Journal of Computational and Graphical Statistics 22(1). Here's a free preprint version. Until this new paper and implementation by Emerson et al., there were no widely available pairs plots that accommodated both numerical and categorical fields.

Benford law and lognormal distributions

March 28, 2013
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$X$

Benford’s law is nowadays extremely popular (see e.g. http://en.wikipedia.org/…). It is usually claimed that, for a given set data set, changing units does not affect the distribution of the first digit. Thus, it should be related to scale invariant distributions. Heuristically, scale (or unit) invariance means that the density of the measure  (or probability function) should be proportional to...

Lots of data != "Big Data"

March 28, 2013
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by Joseph Rickert When talking with data scientists and analysts — who are working with large scale data analytics platforms such as Hadoop — about the best way to do some sophisticated modeling task it is not uncommon for someone to say, "We have all of the data. Why not just use it all?" This sort of comment often...

Rencontres R, Lyon 27-28 June

March 28, 2013
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Last year, the first French-speaking R conference, “Rencontres R“  was held in Bordeaux.  The meeting was a great success, and a second one will be  held in Lyon on 27 and 28 June 2013. The abstract submission deadline of 7 … Continue reading →

RForcecom – An R package provides the connection between R and Salesforce.com

March 28, 2013
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In this post, I’ll introduce an R package RForcecom and its usage. As you may know, R statistical computing environment is the most populous statistical computing software, and Salesforce.com is the world’s most innovative cloud-computing based SaaS (Software-as-a-Service) CRM package.…Read more ›

Mixed model R2 (UPDATED)

March 28, 2013
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R2 is a useful tool for determining how strong the relationship between two variables is. Unfortunately, the definition of R2 for mixed effects models is difficult – do you include the random variable or just the fixed effects? Including just the fixed effects is essentially a standard linear model, while including the random effects could

“Building ractives is so addictive it should be illegal!”

March 27, 2013
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clickme is an amazing R package. I was not sure what to expect when I first saw Nacho Caballero's announcement. I actually was both skeptical and intimidated, but neither reaction was justified. The examples prove its power, and his wiki tutorials ease...

Moving to R 3.0.0 on Ubuntu

March 27, 2013
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As you may (or may not) be aware of, R 3.0.0 is scheduled to be released on April 3rd. Since this is a major release and there may be some growing pains (but I hope not) in the move 3.0.0, here is some information about how I will handle R 3.0.0 on CR...

Rationality, and MS Excel (and other calculators)

March 27, 2013
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$y^x$

This morning, Mathieu had a nice experience in his course on computational method in actuarial science. But let us start with some mathematical formal definitions. First, recall that is – somehow – a standard expression. No one should be surprised to see such an expression. Generally (as explained in http://en.wikipedia.org/… ), this function is defined only when . The...

What does a data scientist do?

March 27, 2013
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The presentation below by Carlos Somohano (founder of Data Science London) provides the best description of a Data Scientist that I've seen in some time: Highlights include: On Slide 14, a history of the Data Science On Slide 22, the essential skills of data scientists (and a platypus) On Slide 26, 10 things data scientists do On Slide 27,...

Build a search engine in 20 minutes or less

March 27, 2013
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…or your money back. author = "Ben Ogorek"Twitter = "@baogorek"email = paste0(sub("@", "", Twitter), "@gmail.com") Setup Pretend this is Big Data: doc1 <- "Stray cats are running all over the place. I see 10 a day!"doc2 <- "Cats are killers. They...

TeXing R tables: Save yourself a lot of typing…

March 27, 2013
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I want to share a function I wrote for my dissertation. The function is useful for putting up to two R tables into one TeX table.You have to load the package 'languageR' to have the dataset 'dative' available.Let's suppose you have two tables, one with...

Getting the data for the sjPlotting-functions into shape #rstats

March 27, 2013
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I sometimes get questions on how to reproduce the samples that are posted in this blog. Currently, I’m referring to these posts: Plotting lm and glm models with ggplot Easily plotting grouped bars with ggplot Simplify frequency plots with ggplot … Weiterlesen →

A few of my favorite moments from LPSC 2013

March 26, 2013
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(Note: this was initially posted on my other blog at Glacial Till, but there were some good bits of information that I wanted to share with the Paleoposse.) Last week I attended my first science conference: The Lunar and Planetary Science Conference in Houston, TX. If you followed me on Twitter, then (for better or for worse)

Got Data from People? Take Dan Ariely’s Coursera course.

March 26, 2013
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A Beginner's Guide to Irrational Behavior started yesterday.  One might not immediately think that such a course would be relevant for statistical modeling.  Well, it is if your statistical modeling uses people as informants.  If the dat...

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