Monthly Archives: May 2015

Top of the Heap: How Much Can We Learn from Partial Rankings?

May 30, 2015
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Top of the Heap: How Much Can We Learn from Partial Rankings?

The recommendation system gives you a long list of alternatives, but the consumer clicks on only a handful: most appealing first, then the second best, and so on until they stop with all the remaining receiving the same rating as not interesting enough...

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Chapter 4 of Modeling data with functional programming in R is out

May 30, 2015
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Chapter 4 of Modeling data with functional programming in R is out

This chapter is on what I call fold-vectorization. In some languages, it’s called reduce, though the concept is the same. …Continue reading →

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Hosting Shiny on Amazon EC2

May 30, 2015
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Hosting Shiny on Amazon EC2

I recently finished some work on a Shiny application which incorporated a Random Forest model. The model was stored in a RData file and loaded by server.R during initialisation. This worked fine when tested locally but when I tried to deploy the application on shinyapps.io I ran into a problem: evidently you can only upload The post Hosting Shiny...

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Update on Snowdoop, a MapReduce Alternative

May 29, 2015
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Update on Snowdoop, a MapReduce Alternative

In blog posts a few months ago, I proposed an alternative to MapReduce, e.g. to Hadoop, which I called “Snowdoop.” I pointed out that systems like Hadoop and Spark are very difficult to install and configure, are either too primitive (Hadoop)  or too abstract (Spark) to program, and above all, are SLOW. Spark is of … Continue reading Update...

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Chances of going to college based on parent’s income

May 29, 2015
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Chances of going to college based on parent’s income

What is the chance of a kid going to college based on parent's income? The post Chances of going to college based on parent’s income appeared first on Decision Science News.

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Which Witch is Which

May 29, 2015
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Which Witch is Which

This post is an elaboration of an iRKernel Notebook which can be found at http://misc.tkelly.org/Which_Witch.html. For a previous article on the iPython Notebook, see here. Every programming language comes pre-packaged with certain basic functions, or methods, that are considered standard. These generally include methods for sorting objects, conversions between basic types (e.g. integer float string),

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R: the Excel Connection

May 29, 2015
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R: the Excel Connection

By Andy Nicholls, Head of Consulting As companies increasingly look beyond the scope of what is logistically possible in Excel more and more companies are approaching Mango looking for help with connecting to Excel from R. With over 6,500 packages … Continue reading →

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Bio7 2.1 Release Candidate RC2 for MacOSX Available

May 29, 2015
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Bio7 2.1 Release Candidate RC2 for MacOSX Available

29.05.2015 I published a MacOSX release candidate for Bio7 2.1 based on Eclipse 4.5 RC2. This release was tested on MacOSX 10.10. The final release will be published after the official Eclipse 4.5 release. Installation: Bio7 2.1 comes as a regular *.dmg installation package. Just drag the Bio7.app to the Applications folder. Bio7 2.1 comes

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testthat 0.10.0

May 29, 2015
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testthat 0.10.0

testthat 0.10.0 is now available on CRAN. Testthat makes it easy to turn the informal testing that you’re already doing into formal automated tests. Learn more at http://r-pkgs.had.co.nz/tests.html. Install the latest version with: install.packages("testthat") There are four big changes in this release: test_check() uses a new reporter specifically designed for R CMD check. It displays

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RStudio 0.99 released

May 29, 2015
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If you download R or Revolution R Open, the R interface is pretty stark — you'll get a command prompt, and not much else. That's fine for quick, interactive calculations, but if you need to do any serious scripting or programming in R, you'll need an interactive development environment (IDE) to be productive. For subscribers to Revolution R Enterprise...

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