December 2010

History makes Stat. Science!

December 31, 2010 | xi'an

While the above heading sounds like a title in reverse, its words are in the “correct” order in that our paper with George Casella, A Short History of Markov Chain Monte Carlo, has been accepted for publication by Statistical Science. This publication may sound weird when considering that the paper ... [Read more...]

R-Chart: Year End Wrap Up

December 31, 2010 | C

Thanks to everyone who visited and commented here at R-Chart over the last year!  Blogging has forced me to crystallize my thoughts and I hope others have benefited a bit from these meanderings.  It it great to interact with the&nbs... [Read more...]

Video of Joy of Stats by Hans Rosling

December 31, 2010 | Larry D'Agostino

The Joy of Stats narrated by Hans Rosling was just produced by BBC and shown to their audience.  Hans Rosling via gapminder.org was kind enough to post the full hour video of the documentary about joys of statistics.  The video is posted on Y... [Read more...]

The R Journal, Vol.2 Issue 2 is out

December 31, 2010 | Tal Galili

The second issue of the second volume of The R Journal is now available . Download complete issue Refereed articles may be downloaded individually using the links below. [Bibliography of refereed articles] Table of Contents Editorial 3 Contributed Research Articles Solving Differential Equations in R Karline Soetaert, Thomas Petzoldt and R. Woodrow ... [Read more...]

Revolutions blog: 2010 statistics

December 31, 2010 | David Smith

Since it's the end of the year, and since this is a statistics blog, I thought I'd pull some data from the blog server and run some number on the blog itself. Overall, the blog has doubled the average number of daily visitors and pageviews compared to 2009. The number of ... [Read more...]

Le Monde puzzle [52]

December 31, 2010 | xi'an

The last puzzle of the year in Le Monde reads as follows (as far as I understand its wording!): Iter(n,x,y) is the function Iter=function(n,x,y){ if (n==1){ output=trunc(y/10)+x*(y%%10) }else{ output=Iter(n-1,x,Iter(1,x,y))} return output } Find the ... [Read more...]

R Packages for Social Search

December 30, 2010 | David Smith

Jesse Bridgewater works on "social search awesomeness" for the Bing search engine, and is setting up his dev environment with the necessary tools including python, vim, and R. Jesse has shared a handy script he uses to install all the specialty packages he uses for his data analysis. This is ... [Read more...]

Blog year 2010 in review

December 30, 2010 | Pat

The blog year started in August and consists of 30-something posts.  Here is a summary. Quant concepts backtesting: Backtesting — almost wordless cointegration: American TV does cointegration efficient frontier: Anomalies meet volatility implied alpha: Implied alpha — almost wordless portfolio theory: Ancient portfolio theory random walk: The tightrope of the random walk ...
[Read more...]

Analysis of Facebook status updates

December 29, 2010 | David Smith

The Facebook Data Team has published an analysis of the status updates of Facebook users, by categorizing words according to the 68 categories of the Linguistic Inquiry and Word Count Dictionary, and tabulating the frequencies of their use. It's fairly interesting to see this kind of analysis applied to Facebook, but ... [Read more...]

More typos in Chapter 5

December 29, 2010 | xi'an

Following Ashley’s latest comments on Chapter 5 of Introducing Monte Carlo Methods with R, I realised Example 5.5 was totally off-the-mark! Not only the representation of the likelihood should have used prod instead of mean, not only the constant should call the val argument of integrate, not only integrate  uses lower ...
[Read more...]

Book Review: R in a Nutshell

December 29, 2010 | Luke Miller

A brief review of R in a Nutshell by Joseph Adler. This book continues to serve as a useful reference that sits on my desk next to my computer, waiting to tell me the name of that command I've just forgotten. [Read more...]

nlm [unused argument(s) (iter = 1)]

December 28, 2010 | xi'an

Ashley put the following comment on Chapter 5 of Introducing Monte Carlo Methods with R”: I am reading chapter 5. I try to reproduced the result on page 128. The R codes don’t work on my laptop. When I try to run the following codes on page 128 __ for (i in 1:(nlm(like,... [Read more...]
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