February 2015

Playing around with #rstats twitter data

February 28, 2015 | [email protected]

As a bit of weekend fun, I decided to briefly look into the #rstats twitter data that Stephen Turner collected and made available (thanks!). Essentially, this data set contains some basic information about over 100,000 tweets that contain the hashtag… Continue reading → [Read more...]

RcppEigen 0.3.2.4.0

February 28, 2015 | Thinking inside the box

A new release of RcppEigen is now on CRAN and in Debian. It synchronizes the Eigen code with the 3.2.4 upstream release, and updates the RcppEigen.package.skeleton() package creation helper to use the kitten() function from pkgKitten for enhanced pac... [Read more...]

John Snow, and Google Maps

February 27, 2015 | arthur charpentier

In my previous post, I discussed how to use OpenStreetMaps (and standard plotting functions of R) to visualize John Snow’s dataset. But it is also possible to use Google Maps (and ggplot2 types of graphs). library(ggmap) get_london [Read more...]

John Snow, and OpenStreetMap

February 27, 2015 | arthur charpentier

While I was working for a training on data visualization, I wanted to get a nice visual for John Snow’s cholera dataset. This dataset can actually be found in a great package of famous historical datasets. library(HistData) data(Snow.deaths) data(Snow.streets) One can easily visualize the ... [Read more...]

Career NBA: The Road Least Traveled

February 27, 2015 | Patrick Rhodes

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...
[Read more...]

Does Balancing Classes Improve Classifier Performance?

February 27, 2015 | Nina Zumel

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 ... [Read more...]

John Chambers Statistical Software Award 2015

February 27, 2015 | David Smith

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 ... [Read more...]

Compiling CoffeeScript in R with the js package

February 26, 2015 | Jeroen Ooms

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 ...
[Read more...]

reshape: from long to wide format

February 26, 2015 | Xianjun Dong

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 ... [Read more...]

How Twitter Improved my Ecological Model

February 26, 2015 | bryce

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’... [Read more...]

Aggregation

February 26, 2015 | Josh Cintolo

Aggregation splits data into subsets, computes summary statistics on each subset, and reports the results in a conveniently summarized form. The aggregate function is one of the most capable functions in the scidb package. The package overloads R’s standard aggregate function for SciDB arrays, using reasonably standard R syntax ... [Read more...]
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