June 2013

Biostatisticians… beware of fuzzy researchers!

June 11, 2013 | mareviv

In the last days I was thinking about about how researchers could collaborate efficiently with their experts in statistics. With the increasing complexity in science, interchanging information can be crucial to get the best results. But what happens when a … Sigue leyendo → [Read more...]

Thursday: Webinar on video game analytics

June 11, 2013 | David Smith

Video games are big business today: Electronic Arts (EA) generated more than 4 billion dollars in revenue last year, and they're not even the biggest player on the block. In addition to big bucks, video games also generate Big Data: 50 terabytes per day at EA alone. So there's an obvious need ... [Read more...]

Finally! Tracking CRAN packages downloads

June 11, 2013 | FelixS

[Update June 12: Data.tables functions have been improved (thanks to a comment by Matthew Dowle); for a similar approach see also Tal Galili's post] The guys from RStudio now provide CRAN download logs (see also this blog post). Great work! I always asked myself, how many people actually download my ... [Read more...]

R package development

June 11, 2013 | Markus Gesmann

Building R packages is not particular hard, but it can be a bit of a daunting endeavour at the beginning, particularly if you are more of a statistician than a computer scientist or programmer. Some concepts may appear foreign or like red tape, yet man... [Read more...]

R: Measures of Skewness and Kurtosis

June 10, 2013 | Al Asaad

Skewness and kurtosis in R are available in the moments package (to install a package, click here), and these are:Skewness - skewness; and,Kurtosis - kurtosis.Example 1. Mirra is interested on the elapse time (in minutes) she spends on riding a tricycl... [Read more...]

Measures of Skewness and Kurtosis

June 10, 2013 | Al-Ahmadgaid Asaad

Skewness and kurtosis in R are available in the moments package (to install an R package, click here), and these are:Skewness - skewnessKurtosis - kurtosisExample 1. Mirra is interested in the elapse time (in minutes) she spends on riding a tricycle fr... [Read more...]

Microsoft Office Metadata with R

June 10, 2013 | Joe'sDataDiner

Sometimes I need to retrieve various items of metadata from Microsoft Office files. For the 'old-style' (i.e. '.doc' and '.xls') files perhaps a solution in python, such as hachoir, was the best way to extract this data from the ole2 file format -... [Read more...]

Bringing R to the Enterprise – new white paper available

June 10, 2013 | mhornick

Check out this new white paper entitled "Bringing R to the Enterprise -  A Familiar R Environment with Enterprise-Caliber Performance, Scalability, and Security." In this white paper, we begin with "Beyond the Laptop" exploring the ability to run R code in the database, working with CRAN packages at the database ... [Read more...]

In case you missed it: May 2013 Roundup

June 10, 2013 | David Smith

In case you missed them, here are some articles from May of particular interest to R users: Billions of geotagged Tweets create a beautiful map of the world when plotted with the ggmap package. A review of Ryan Sheftel's talk at R/Finance, on how he uses R on the ... [Read more...]

Running time

June 10, 2013 | Gianluca Baio

Marta and I are doing some re-analysis of our Eurovision contest (some context here and here). We have slightly modified our original model (mostly, I have navigated the mess in Marta's notation $-$ it's OK: I'm not at risk of her mighty wrath, as I've... [Read more...]

Le Monde puzzle [#822]

June 10, 2013 | xi'an

For once Le Monde math puzzle is much more easily solved on a piece of paper than in R, even in a plane from Roma: Given a partition of the set {1,…,N} in k groups, one considers the collection of all subsets of  the set {1,…,N} containing at least one ...
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Measure of Relative Variability

June 10, 2013 | Al-Ahmadgaid Asaad

The measure of relative variability is the coefficient of variation (CV). Unlike measures of absolute variability, the CV is unitless when it comes to comparisons between the dispersions of two distributions of different units of measurement. In R, CV ... [Read more...]

Ripley Facts

June 10, 2013 | msuzen

Normally, this blog would only contain technical and scientific related posts. But this time I would like to share with you a very interesting phenomenon I came across on the R mailing list(s). I call it 'Ripley Facts' after the prolific statistician, ... [Read more...]

Introduction to stable distributions for finance

June 10, 2013 | Pat

A few basics about the stable distribution. Previously “The distribution of financial returns made simple” satirized ideas about the statistical distribution of returns, including the stable distribution. Origin As “A tale of two returns” points out, the log return of a long period of time is the sum of the ... [Read more...]

Measures of Absolute Variability

June 10, 2013 | Al-Ahmadgaid Asaad

Measures of absolute variability deal with the dispersion of the data points. This include the following:Range - rangeInterquartile Range - IQRQuartile DeviationAverage DeviationStandard Deviation - sdThese measures of variability restrict to uniform u... [Read more...]

Sobol Sensitivity Analysis

June 10, 2013 | Rcpp Gallery

Sensitivity analysis is the task of evaluating the sensitivity of a model output Y to input variables (X1,…,Xp). Quite often, it is assumed that this output is related to the input through a known function f :Y= f(X1,…,Xp). Sobol indices are generalizing the coefficient of the coefficient ...
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