Monthly Archives: August 2014

David Smith, the useR! 2014 Interview

August 25, 2014
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David Smith, the useR! 2014 Interview

“At one point, the only source for daily R news was David Smith’s blog.” —...

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Of Needles and Haystacks: Building an Accurate Statewide Dropout Early Warning System in Wisconsin

August 25, 2014
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Of Needles and Haystacks: Building an Accurate Statewide Dropout Early Warning System in Wisconsin

For the past two years I have been working on the Wisconsin Dropout Early Warning System, a predictive model of on time high school graduation for students in grades 6-9 in Wisconsin. The goal of this project is to help schools and educators have an ea...

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8 new R jobs (for Augest 25th 2014)

August 25, 2014
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r_jobs

This is the bimonthly R Jobs post (for 2014-08-25), based on the R-bloggers’ sister website: R-users.com. If you are an employer who is looking to hire people from the R community, please visit this link to post a new R job (it’s free, and registration takes less than 10 seconds). If you are a job seekers, please follow the links below to learn more and apply for your job of interest (or visit previous...

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Some love for ggplot2

August 25, 2014
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Some love for ggplot2

With all the recent buzz about ggvis (this, this, and this) it’s often easy to forget all that ggplot2 offers as a graphics package. True, ggplot is a static approach to graphing unlike ggvis but it has fundamentally changed the way we think about plots in R. I recently spent some time thinking about some

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New in OpenCPU 1.4.4: session namespaces

August 24, 2014
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New in OpenCPU 1.4.4: session namespaces

The OpenCPU system exposes an HTTP API for embedded scientific computing with R. This provides reliable and scalable foundations for integrating R based analysis and visualization modules into pipelines, web applications or big data infrastruct...

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Forecasting with R in WA

August 24, 2014
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On 23–25 September, I will be running a 3-day workshop in Perth on “Forecasting: principles and practice” mostly based on my book of the same name. Workshop participants will be assumed to be familiar with basic statistical tools such as multiple regression, but no knowledge of time series or forecasting will be assumed. Some prior experience in R is...

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R: Stem (Pre-Processed) Text Blocks

August 24, 2014
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R: Stem (Pre-Processed) Text Blocks

Objective I recently needed to stem every word in a block of text i.e. reduce each word to a root form. Problem The stemmer I was using would only stem the last word in each block of text e.g. Solution I wrote a function which splits a block of text into individual words, stems each

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JAGS and Stan

August 24, 2014
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JAGS and Stan

During the last year I have been running some estimations in both JAGS and Stan. In that period I have seen one example where JAGS could not get me decent samples (in the sense of low Rhat and high number of effective samples) but that was data which I...

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Computational Actuarial Science, with R

August 24, 2014
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The book Computational Actuarial Science, with R is officially out. In the introduction of the book, and on the website of CRC, it is mentioned that the datasets can be found “in an R package on CRAN“, which is unfortunately incorrect. Some datasets are too large, so the package can not be uploaded on CRAN. Hopefully, Christophe host the package...

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R OOP – a little privacy please?

August 23, 2014
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As of late, I’ve been making heavy use of Reference Classes in R. They are easier for me to wrap my mind around since they adopt a usage style more like “traditional” OOP languages like Java. Primarily, object methods are part of the class definition and accessed via the instantiated object.For instance: With S3/S4 classes, you define...

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