Monthly Archives: February 2009

Single Letter Frequencies in English

February 15, 2009
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Single Letter Frequencies in English

Every time that I read a paper that discusses the frequencies of single letters in English, I feel like I should sit down and calculate them for myself from a sample of English text. Today, I finally did. Here are the probabilities and negative log pro...

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R in SAS

February 15, 2009
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R in SAS

Another "proof" that R definitely is one of mainstream statistical packages is the news that SAS will provide an interface to R via SAS/IML Studio (today known as SAS Stat Studio).

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R-Sessions 32: Forward.lmer: Basic stepwise function for mixed effects in R

February 13, 2009
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Intended to be a customized solution, it may have grown to be a little more. forward.lmer is an early installment of a full stepwise function for mixed effects regression models in R-Project. I may put in some work to extend it, or I may not. Neverthel...

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New project: RInside

February 12, 2009
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A few days ago, I started a new project called RInside by uploading a few files to a new SVN repo at R-Forge. RInside makes it easy to embed R into your own C++ application by hiding the nitty gritty of initializing an R interpreter behind a simple abstraction. More information is at a (currently pretty simple) RInside...

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Fitting Legendre (orthogonal) polynomials in R

February 10, 2009
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Fitting Legendre (orthogonal) polynomials in R

Frederick Novomestky packaged a series of orthogonal polynomials in the orthopolynom R package. However, his functions can not be used "directly" in a statistical model, say in lm(). There is no need to use functions from orthopolynom package, since th...

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Positioning charts with fig and fin

February 9, 2009
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R offers several ways to spatially orient multiple graphs in a single graphing space. The layout() function and mfrow/mfcol parameter settings are adequate solutions for many tasks and allow the graphing space to be broken up into tabular or matrix-ba...

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Princeton Graduate Student Housing

February 8, 2009
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Princeton Graduate Student Housing

For any Princeton graduate students who are interested, here’s the success rate for graduate students applying for school housing. These charts were built using the data from the 2008-2009 Room Draw Statistics pamphlet provided by the Division of Hou...

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Our new R package: R2jags

February 8, 2009
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I have got emails occasionally from JAGS users, asking about our new R package: R2jags. Basically, R2jags runs JAGS via R and makes postanalysis easier to be done in R. Taking advantage of the functions...

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Baby Got Stats!

February 8, 2009
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I was completely tickled last year with the oh so amusing Statz Rappers. It kept me and my nerdy stats friends laughing for days. Rapping. Stats. The Internet. Good times. But little did I know that rapping about statistics was really just hitting its stride on youtube. This is Why We Plot began my trip

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ave

February 8, 2009
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I discovered a new, very useful, R function yesterday: ave. This is what it does: “Subsets of ‘x‘ are averaged, where each subset consist of those observations with the same factor levels.” But interestingly, you can use any function other than average. The output of that function is set against each observation. I wanted

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