Monthly Archives: February 2015

Career NBA: The Road Least Traveled

February 27, 2015
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Career NBA: The Road Least Traveled

The bell rings - time to go to practice. Jarnell Stokes heads over to the gym, changes, and starts warming up with his teammates. It's his Junior year in high school. The Memphis, Tennessee native has a lot on his mind; soon he'll have to mak...

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Does Balancing Classes Improve Classifier Performance?

February 27, 2015
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Does Balancing Classes Improve Classifier Performance?

It’s a folk theorem I sometimes hear from colleagues and clients: that you must balance the class prevalence before training a classifier. Certainly, I believe that classification tends to be easier when the classes are nearly balanced, especially when the class you are actually interested in is the rarer one. But I have always been … Continue reading Does...

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John Chambers Statistical Software Award 2015

February 27, 2015
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In 1998 John M. Chambers (now a member of R-core) won the ACM Software System Award for the S Language, which (in the words of the committee) "forever altered how people analyze, visualize, and manipulate data". John graciously donated the prizemoney to support budding researchers in statistical computing: his Statistical Software Award has been granted annually since 2000. For...

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RcppArmadillo 0.4.650.1.1 (and also 0.4.650.2.0)

February 26, 2015
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A new Armadillo release 4.650.1 was released by Conrad a few days ago. Armadillo is a powerful and expressive C++ template library for linear algebra aiming towards a good balance between speed and ease of use with a syntax deliberately close to a Matlab. It turned out that this release had one shortcoming with respect to the C++11 RNG initializations...

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Compiling CoffeeScript in R with the js package

February 26, 2015
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Compiling CoffeeScript in R with the js package

A new release of the js package has made it’s way to CRAN. This version adds support for compiling Coffee Script. Along with the uglify and jshint tools already in there, the package now provides a very complete suite for compiling, validating, reformating, optimizing and analyzing JavaScript code in R. Coffee Script According to its website, CoffeeScript is...

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reshape: from long to wide format

February 26, 2015
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reshape: from long to wide format

This is to continue on the topic of using the melt/cast functions in reshape to convert between long and wide format of data frame. Here is the example I found helpful in generating covariate table required for PEER (or Matrix_eQTL) analysis:Here ...

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How Twitter Improved my Ecological Model

February 26, 2015
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How Twitter Improved my Ecological Model

For a last couple weeks I’ve been working on a marine ecosystem model using a technique called Inverse Modeling(1)I’ll be sure to do a writeup on what Inverse Modeling is and what makes it interesting in the future.; and while there’s been lots of progress, I’m starting to get to the point where the model takes some

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Why I think twice before editing plots in Powerpoint, Illustrator, Inkscape, etc.

February 26, 2015
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Why I think twice before editing plots in Powerpoint, Illustrator, Inkscape, etc.

Thanks to a nice post by Meghan Duffy on the Dynamic Ecology blog (How do you make figures?), we have some empirical evidence that many figures made in R by ecologists are secondarily edited in other programs including MS Powerpoint, Adobe Illustrator, Inkscape, and Photoshop. This may not be advisable* for two reasons: reproducibility and bonus learning. Reproducibility R is...

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Using and Abusing Data Visualization: Anscombe’s Quartet and Cheating Bonferroni

February 26, 2015
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Using and Abusing Data Visualization: Anscombe’s Quartet and Cheating Bonferroni

Anscombe’s quartet comprises four datasets that have nearly identical simple statistical properties, yet appear very different when graphed. Each dataset consists of eleven (x,y) points. They were constructed in 1973 by the statistician Francis Anscombe to demonstrate both the importance of graphing data before analyzing it and the effect of outliers on statistical properties.Let’s load and view the data....

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Announcing shinyapps.io General Availability

February 26, 2015
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Announcing shinyapps.io General Availability

RStudio is excited to announce the general availability (GA) of shinyapps.io. Shinyapps.io is an easy to use, secure, and scalable hosted service already being used by thousands of professionals and students to deploy Shiny applications on the web. Effective today, shinyapps.io has completed beta testing and is generally available as a commercial service for anyone.

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