Monthly Archives: April 2013

Second edition of Crawley’s The R Book

April 9, 2013
By
Second edition of Crawley’s The R Book

The second edition of Michael Cawley's The R Book is available from Wiley. According to the publisher, the new edition boasts the following features:"Features full colour text and extensive graphics throughout.Introduces a clear structure with numbered...

Read more »

Some R User Group Presentations from Europe

April 9, 2013
By

by Joseph Rickert I am beginning to get excited about going to Spain for useR 2013 which will be held at the University of Castilla-La Mancha, so I have been using the links on the Revolution's local user directory webpage to see what the European R user groups are doing. Here are just a few highlights of materials that...

Read more »

Behind the NCAA Visualizer: Python, R and JavaScript

April 9, 2013
By

Rodrigo Zamith's NCAA Tournament Visualizer is a great example of an interactive data visualization. If you want to create something similar, Rodrigo has shared detailed behind-the-scenes information on how it was created. He used a mix of tools: Python was used to scrape team statistics fromt the NCAA website R was used to prepare the data for analysis, and...

Read more »

Matrix Cumulative Coherence: Fourier Bases, Random and Sensing Matrices

April 9, 2013
By

Compressive sampling (CS) is revolutionizing the way we process analog to digital conversion, our understanding of linear systems and the limits of information theory. One of the key concept in CS is that a signal can be represented in a sparse bases o...

Read more »

Spring Cleaning Data: 2 of 6- Changing Column Names and Adding a Column

April 9, 2013
By

The first post (found here) we downloaded the data and imported it to R using the gdata package. This post we will be changing the column names to make them more reasonable, and adding a quarter variable. The reason for changing the column names is bec...

Read more »

Happy biRthday

April 9, 2013
By
Happy biRthday

Today is my birthday. It’s also the birthday of a close friend. What an incredible coincidence! Or wait, may be is just expected. One more time R comes into our help, because it has a built-in function to answer our question. … Continue reading →

Read more »

How to set axis options in googleVis

April 9, 2013
By
How to set axis options in googleVis

Setting axis options in googleVis charts can be a bit tricky. Here I present two examples where I set several options to customise the layout of a line and combo chart with two axes. The parameters have to be set in line with the Google Chart Tools API, which uses a JavaScript syntax....

Read more »

Changing figure options mid-chunk (in a loop) using the pander package.

April 9, 2013
By
Changing figure options mid-chunk (in a loop) using the pander package.

I wrote already about changing figure options mid-chunk in reproducible research. This can be important  e.g. if you are looping through a dataset to produce a graphic for each variable but the figure width or height need to depend on properties of the variables, e.g. if you are producing histograms and want the figures to

Read more »

Gradient Boosting: Analysis of LendingClub’s Data

April 8, 2013
By
Gradient Boosting: Analysis of LendingClub’s Data

An old 5.75% CD of mine recently matured and seeing that those interest rates are gone forever, I figured I’d take a statistical look at LendingClub’s data. Lending Club is the first peer-to-peer lending company to register its offerings as securities with the Securities and Exchange Commission (SEC). Their operational statistics are public and available for download. The latest

Read more »

Knoxville R Users Group Formed, Free Training Offered

April 8, 2013
By
Knoxville R Users Group Formed, Free Training Offered

R is popular free and open-source software for graphics and data analytics. The Knoxville R Users Group is being formed to help people learn R and improve their skills with it. Three departments of The University of Tennessee are working together … Continue reading →

Read more »