There are some pieces of code that are so simple and obvious that they really ought to be included in base R somewhere. Geometric mean and standard deviation – a staple for anyone who deals with lognormally distributed data. geomean [Read more...]

Hans Rosling eat your heart out! It is now possible to interface R statistics software to Google’s Gapminder inspired Chart Tools. The plots below were produced using the googleVis R package and three datasets from the Gapminder website. The first shows the relationship between income, life expectancy and population ... [Read more...]

Get the new macro now hosted on githubEdit 18th Jan 2011: The below text refers to the old version of the macro and is no longer relevant, a new post will  describe the new macro, and it is also documented on the github site.As a follow ... [Read more...]

Several R functions take model formulae as parameters. Model formulae are symbolic expressions. They define a relationship between variables rather than an arithmetic expression to be evaluated immediately. Model formulae are defined with the tilde ope... [Read more...]

English cricket is strong once again. And it is great to see that (after all they invented the gentleman's game).In a sharp contrast to previous tours of Australia, England outplayed Australia on their home ground in the recently concluded Ashes 2... [Read more...]

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Just before Xmas, Conrad Sanderson released version 1.1.0 of Armadillo, his templated C++ library for linear algebra. Which I only noticed this week, so here comes version 0.2.11 of RcppArmadillo, our Rcpp-based integration into R. The only other ... [Read more...]

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The following example was shown in an advanced statistics seminar held in tel aviv. The material for the presentation comes from C.M Bishop’s book : Pattern Recognition and Machine Learning by Springer(2006). One way of separating 2 categories using linear sub spaces of the input space (e.g. planes for 3... [Read more...]

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A new posting on arXiv by Benedict Escoto on a simulation method for approximating normalising constants (i.e. evidence) with an eye-catching name! Here is the abstract This paper describes a method for estimating the marginal likelihood or Bayes factors of Bayesian models using non-parametric importance sampling (“arrogance sampling”). This ... [Read more...]

PMML (Predictive Model Markup Language) is the standard language used by all the top analytic vendors (commercial and open-source) to represent predictive models. These include IBM/SPSS, SAS, KXEN, TIBCO, STATISICA, R, KNIME, and RapidMiner (for detail... [Read more...]

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Leonid asked me to do a quick survival analysis of two different types of mouse (m430 and m210) with surgically implanted tumours (or something like that). The data was in the wrong format but after transforming it looked like this: In my opini... [Read more...]

The visualisation above shows the average relative duration of Boris Bikers’ weekday journeys over a 4 month period at hourly intervals. For each time step the average journey time (in seconds) from each docking station has been calculated.This information is interesting because it shows the preference for short journeys around ... [Read more...]

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A new version of the formatR package is available on CRAN now (binary packages are still on the way). There are three major updates: the inline comments will also be preserved in most cases (in earlier versions, only single lines of comments are preserved) tidy.source() gained a new argument ... [Read more...]

Just developed a small crawler to check my online content at binfalse.de in terms of W3C validity and the availability of external links. Here is the code and some statistics... [Read more...]

As many people are aware Hans Rosling is an enthusiastic swedish academic with a passion for statistics who recently presented the program The Joy of Stats. One of the great things about Hans Rosling is his presentations and the interactive graphics that he uses to make his points. Fast Tube ... [Read more...]