August 2011

le logiciel R

August 24, 2011 | xi'an

For once, here is a book review I wrote in French about the book Le logiciel R, written by Pierre Lafaye de Micheaux (Université de Montréal), Rémy Drouilhet (Université de Grenoble 2) and Benoît Liquet (Université de Bordeaux 2): Ce livre édité par Springer (dans la même collection ... [Read more...]

The Open Governance Index: Results for The R Project

August 24, 2011 | BioStatMatt

Just over two weeks ago, I invited readers to complete the Open Governance Index (OGI) Questionnaire regarding The R Project. The OGI evaluates several facets of governance in open source projects (OGI publication). The OGI questionnaire is reproduced below, and each question is linked from the table of useR responses. ... [Read more...]

Another Rchievement of the day

August 24, 2011 | wkmor1

Time for another Rchievement of the day. This is a neat little example demonstrating the power of control flow (type ?Control in R to find out more). But perhaps a not-so obvious way of using it. So what does this … Continue reading → [Read more...]

The problem with R? Too much new stuff!

August 23, 2011 | David Smith

In a tongue-in-cheek post at the Information Management blog, Steve Miller shares his "frustration" with R: package developers keep on releasing new functionality for R that makes his own work obsolete. For example, there's now pre-packaged functionality in R for enhanced dotplots, Economist-style graphics, additive regression models and more, which ... [Read more...]

expectation-propagation and ABC

August 23, 2011 | xi'an

“It seems quite absurd to reject an EP-based approach, if the only alternative is an ABC approach based on summary statistics, which introduces a bias which seems both larger (according to our numerical examples) and more arbitrary, in the sense that in real-world applications one has little intuition and even ... [Read more...]

Data manipulations

August 23, 2011 | andrew

In the last Utah R Users group meeting I gave a presentation on data manipulations on R, and today I found through the plyr mailing list two commands that I was previously unaware of that should definitely be made mention of, arrage and mutate. [Read more...]

Z-Tests: Should we even bother?

August 23, 2011 | 0utlieR

Should statistical teachers continue to teach z-tests?vote:  save z-test, or stop z-testLooking at textbooks, articles and general research I cannot remember the last time I saw someone use a z-test in a study. I have seen many a t-test, ANOVA, ch...
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Anonymising data

August 23, 2011 | richierocks

There are only three known jokes about statistics in the whole universe, so to complete the trilogy (see here and here for the other two), listen up: Three statisticians are on a train journey to a conference, and they get chatting to three epidemiologists who are also going to the ... [Read more...]

Time Series Analysis and Mining with R

August 23, 2011 | Yanchang Zhao

Time series data are widely seen in analytics. Some examples are stock indexes/prices, currency exchange rates and electrocardiogram (ECG). Traditional time series analysis focuses on smoothing, decomposition and forecasting, and there are many R functions and packages available for those … Continue reading → [Read more...]

Random input software testing

August 23, 2011 | Pat

The usual approach to testing software is to create a specific problem and see if the software gets the correct answer.  Although this is very useful, there are problems with it: It is labor-intensive It almost totally neglects to test the code that throws errors There can be unconscious bias ...
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A warning on the R save format

August 23, 2011 | Allan Engelhardt

The save() function in the R platform for statistical computing is very convenient and I suspect many of us use it a lot. But I was recently bitten by a “feature” of the format which meant I could not recover my data. I recommend that you save data in a ...
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Maiden voyage

August 23, 2011 | G. Jay Kerns

Who Me. I'm an associate professor of Statistics at Youngstown State University in Youngstown, Ohio, USA. I've been using R for about 7 years, Emacs about 3 years, git about 1 year, and Org-Mode for less than a year. What I want this blo... [Read more...]

Subjugation to the Sigmas

August 23, 2011 | Neil Gunther

No doubt you've heard about the tyranny of the 9s in reference to computer system availability. You're probably also familiar with the phrase six sigma, either in the context of manufacturing process quality control or the improvement of business processes. As we discovered in the recent Guerrilla Data Analysis Techniques ... [Read more...]

Popular topics at the BioStar Q&A site

August 23, 2011 | nsaunders

Which topics are the most popular at the BioStar bioinformatics Q&A site? One source of data is the tags used for questions. Tags are somewhat arbitrary of course, but fortunately BioStar has quite an active community, so “bad” tags are usually edited to improve them. Hint: if your question ... [Read more...]

Drawdown Visualization

August 22, 2011 | klr

Drawdown is my favorite measure of risk.  It picks up extended autocorrelated pain often not seen in risk measures, and best illustrates frustration, panic, and loss of confidence (Drawdown Control Can Also Determine Ending Wealth).  I though...
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More useR! 2011 roundups

August 22, 2011 | David Smith

If you missed last week's worldwide R user conference at the University of Warwick, several attendees have posted informative roundups of the event. Check out these posts from Patrick Burns, Karl Broman, Colin Gillespie, Pairach Piboonrungroj and Richie Cotton (which features a rare, good Statistics joke). My own roundup of ... [Read more...]
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