February 2015

Book Review: Mastering Scientific Computing with R

February 28, 2015 | 0 Comments

PACKT marketing guys again contact me to review their new book Mastering Scientific Computing with R.  The book 432 pages (including covers) book is consist of 10 chapters which starts from basic R and ends with advanced data management. However, ...
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One weird trick to compile multipartite dynamic documents with Rmarkdown

February 28, 2015 | 0 Comments

This afternoon I stumbled across this one weird trick an undocumented part of the YAML headers that get processed when you click the ‘knit’ button in RStudio. Knitting turns an Rmarkdown document into a specified format, using the rmarkdown package’s render function to call pandoc (a universal document converter ... [Read more...]

Playing around with #rstats twitter data

February 28, 2015 | 0 Comments

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...]

Tools in Tandem – SQL and ggplot. But is it Really R?

February 28, 2015 | 0 Comments

Increasingly I find that I have fallen into using not-really-R whilst playing around with Formula One stats data. Instead, I seem to be using a hybrid of SQL to get data out of a small SQLite3 datbase and into an R dataframe, and then ggplot2 to render visualise it. So ...
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Scalable Machine Learning for Big Data Using R and H2O

February 28, 2015 | 0 Comments

Part I Part II H2O is an open source parallel processing engine for machine learning on Big Data. This prediction engine is designed by, h20, a Mountain View-based startup that has implemented a number of impressive statistical and machine learning algorithms to run on HDFS, S3, SQL and NoSQL. ... [Read more...]

RcppEigen 0.3.2.4.0

February 28, 2015 | 0 Comments

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 | 0 Comments

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 | 0 Comments

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 | 0 Comments

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 | 0 Comments

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 | 0 Comments

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...]

RcppArmadillo 0.4.650.1.1 (and also 0.4.650.2.0)

February 26, 2015 | 0 Comments

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 ... [Read more...]

Compiling CoffeeScript in R with the js package

February 26, 2015 | 0 Comments

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 ...
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reshape: from long to wide format

February 26, 2015 | 0 Comments

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 | 0 Comments

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...]

Announcing shinyapps.io General Availability

February 26, 2015 | 0 Comments

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 ... [Read more...]
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