Monthly Archives: June 2011

Example 8.42: skewness and kurtosis and more moments (oh my!)

June 27, 2011
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While skewness and kurtosis are not as often calculated and reported as mean and standard deviation, they can be useful at times. Skewness is the 3rd moment around the mean, and characterizes whether the distribution is symmetric (skewness=0). Kurtos...

A Winking Pink Elephant

June 27, 2011
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The title of chapter 5 in my Guerrilla Capacity Planning book is, "Evaluating Scalability Parameters," and underneath it you'll see this quote:"With four parameters I can fit an elephant. With five I can make his trunk wiggle." —John von NeumannIn that vein, Guerrilla alumnus Stephen O'C. pointed me at a recent blog post and paper (PDF)...

June 26, 2011
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Data on the map While surfing around the Internet I accidentally found the googleVis library for R and especially the gvisGeoMap-function which creates a map based on country data.  In a table hockey scene we have a great World Ranking … Continu...

NHL Statistics – Goals scored by age

June 26, 2011
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NHL Statistics, part 1 Goals scored by age Data Twirling blog gave instructions to how to get NHL statistics data from the website and I saw an opportunity to learn R and statistics with help of data I know and … Continue reading →

Topic Modeling the Sarah Palin Emails

June 26, 2011
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LDA-based Email Browser Earlier this month, several thousand emails from Sarah Palin’s time as governor of Alaska were released. The emails weren’t organized in any fashion, though, so to make them easier to browse, I’ve been working on some topic modeling (in particular, using latent Dirichlet allocation) to separate the documents into different groups. I threw...

RObjectTables are AWESOME

June 26, 2011
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Why isn't everyone using the RObjectTables package? This is the best thing ever! Here's the basic idea of RObjectTables: An environment is an object where you can lookup names and associate them with values. And in particular its where you look up variables used in an expression. But there's no reason you can't take any other object that associates names...

Bayesian Fall school in La Rochelle

June 26, 2011
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The French agronomy research institute INRA is organising a Fall school in La Rochelle, Nov. 28 – Dec. 02, on Bayesian methods, oriented towards the applications in food sciences, environmental sciences, and biology. The provisional program (in French) is ■ Initiation aux outils informatiques R et WinBUGS (TP et réalisation de projets sur ordinateur) ■

Next Steps: Drafting the R Help Files

With RTextTools now released and the feedback rolling in, the development team is getting the ball rolling on the help documentation for the library. Currently, you cannot access help files about the library or its functions from within R. However, we do offer a draft of a quick start guide in PDF format under the Documentation section of the...

NHL Statistics – Goals scored by age

June 26, 2011
By

NHL Statistics, part 1 Goals scored by age Data Twirling blog gave instructions to how to get NHL statistics data from the website and I saw an opportunity to learn R and statistics with help of data I know and … Continue reading →

June 26, 2011
By

Data on the map While surfing around the Internet I accidentally found the googleVis library for R and especially the gvisGeoMap-function which creates a map based on country data.  In a table hockey scene we have a great World Ranking … Continue reading →