visualization

Rose plot using Deducers ggplot2 plot builder

August 16, 2010 | Tal Galili

The (excellent!) LearnR blog had a post today about making a rose plot in ggplot2. Following today’s announcement, by Ian Fellows, regarding the release of the new version of Deducer (0.4) offering a strong support for ggplot2 using a GUI plot builder, Ian also sent an e-mail where he shows ... [Read more...]

Benford’s Law Tests for Wikileaks Data

August 1, 2010 | Drew Conway

In my first post on the WL Afghanistan data I provided a very high-level view of the data, and found that it generally met expectations for frequency given its context and presumed data generating process. Next, I will look a bit deeper at this process and test if the observed ...
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Anatomy of a Life-Milestone Announcement on Facebook

July 15, 2010 | Drew Conway

As I have mentioned, I recently returned for a lovely trip to Europe. While on vacation my brilliant, beautiful, funny, and all around perfect girlfriend accepted my invitation to be my wife. Pause for shared overwhelming feeling of joy… While I am still basking in the glow of being the ...
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Visualization of regression coefficients (in R)

July 2, 2010 | Tal Galili

Update (07.07.10): The function in this post has a more mature version in the “arm” package. See at the end of this post for more details. * * * * Imagine you want to give a presentation or report of your latest findings running some sort of regression analysis. How would you do it? This ... [Read more...]

Clustergram: visualization and diagnostics for cluster analysis (R code)

June 15, 2010 | Tal Galili

About Clustergrams In 2002, Matthias Schonlau published in “The Stata Journal” an article named “The Clustergram: A graph for visualizing hierarchical and . As explained in the abstract: In hierarchical cluster analysis dendrogram graphs are used to visualize how clusters are formed. I propose an alternative graph named “clustergram” to examine how ... [Read more...]

Canadian CPI: Visualization Brainstorm

May 27, 2010 | Wojciech Gryc

After finishing the R prototype for data visualization, I've started abstracting the various methods necessary to create beautiful graphs. While there's no preliminary version of the R package yet, I think I've taken a number of exciting steps. These include: Abstracting graph objects. Objects such as lines, scatter plots, and ... [Read more...]

Prototype: Web-Friendly Visualizations in R

May 18, 2010 | Wojciech Gryc

Developing web-friendly data visualizations is not very difficult, though as far as I know, a package that allows one to do this directly in R does not exist (e-mail me if you know of one). As someone who has been developing lots of data-oriented software tools, it's always nice to ... [Read more...]

Correlation scatter-plot matrix for ordered-categorical data

April 7, 2010 | Tal Galili

When analyzing a questionnaire, one often wants to view the correlation between two or more Likert questionnaire item’s (for example: two ordered categorical vectors ranging from 1 to 5). When dealing with several such Likert variable’s, a clear presentation of all the pairwise relation’s between our variable can be ... [Read more...]

R-Node: a web front-end to R with Protovis

April 3, 2010 | Tal Galili

Update (April 6 – 2010) : R-Node now has it’s own a website, with a dedicated google group (you can join it here) * * * * The integration of R into online web services is (for me) one of the more exciting prospects in R’s future. That is way I was very excited coming across ... [Read more...]

How Misinformed are Tea Party Protesters About Tax Policy?

March 25, 2010 | Drew Conway

For those of you used to reading about international relations, I apologize for the following brief foray into American politics. It appears that the American Enterprise Institute and David Frum have decided to (abruptly) part ways. Before David left, however, he and his team of interns provided some interesting statistical ... [Read more...]
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