Posts Tagged ‘ statistics ’

Pearson vs. Spearman Correlation Coefficients

February 17, 2009
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Pearson vs. Spearman Correlation Coefficients

One of the misuses of statistical terminology that annoys me most is the use of the word “correlation” to describe any variable that increases as another variable increases. This monotonic trend seems worth looking for, but it plainly is not what m...

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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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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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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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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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If I Had a Text File, I’d Hack Regexes in the Morning

February 4, 2009
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If I Had a Text File, I’d Hack Regexes in the Morning

Yesterday the topic of academic citation counts came up, so I decided that I should write up some tools for exploring cite counts. The first thing I did was to build a cheap screenscraper in Ruby for pulling citation count information from Google schol...

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Visualizing Eigenfactors

January 30, 2009
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These interactive graphics are simply beautiful. And they just so happen to be profoundly informative about the structure of modern science as well. Here’s to the hope that we will see more work from Moritz Stefaner soon that shows how our aesthetic ...

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MCMCglmm package for R

January 29, 2009
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MCMCglmm package for R

Jarrod Hadfield published MCMCglmm package on CRAN. The package can fit generalised linear mixed models via MCMC methods. Bellow is the abstract from the vignette. The list of supported models is quite impressive. Nice job Jarrod! This is not the first...

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R gets some -E-S-P-E-C-T

January 12, 2009
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R gets some -E-S-P-E-C-T

NEW YORK TIMES STORY ON THE APPEAL OF R (click to view movie) It is no secret that Decision Science News is crazy about the R language for statistical computing. Find out why R is so great in this New York Times article. Then start to teach yourself R with our short series of video

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Forecasting Presidential Elections

January 7, 2009
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Forecasting Presidential Elections

Because of Andrew Gelman’s strong, repeated recommendations, I’ve been reading “Forecasting Presidential Elections” by Steven J. Rosenstone for the last two days. It’s quite a remarkable book and complex enough that I’m sure I’ll return t...

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