Monthly Archives: January 2011

An example of linear discriminant analysis

January 8, 2011
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An example of linear discriminant analysis

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 3D inputs, lines for 2D inputs, [&hellip

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Building a fact-based world view

January 7, 2011
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Building a fact-based world view

Gapminder is an independent foundation based in Stockholm, Sweden. Its mission is “to debunk devastating myths about the world by offering free access to a fact-based world view“. They provide free online tools, data (more than 400 datasets freely available!) and videos “to better understand the changing world“. The initial development of Gapminder was the

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Arrogance sampling

January 7, 2011
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Arrogance sampling

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 method can also be used to

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Predictive Analytics with R, PMML, ADAPA, and Excel

January 7, 2011
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Predictive Analytics with R, PMML, ADAPA, and Excel

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...

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Heatmap tables

January 7, 2011
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Heatmap tables

I blogged earlier (http://socialdatablog.com/what-is-wrong-with-this-graph) about the well-known risks of implying a continuous data scale in a graph where there isn't one. I just produced this alternative in the form of a heatmap table, i.e. a heatmap in which the numbers themselves are also shown. Perhaps not quite as intuitive but less misleading. It uses the

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Heatmap tables

January 7, 2011
By
Heatmap tables

I blogged earlier (http://socialdatablog.com/what-is-wrong-with-this-graph) about the well-known risks of implying a continuous data scale in a graph where there isn't one. I just produced this alternative in the form of a heatmap table...

Read more »

survival curves for Leonid

January 7, 2011
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survival curves for Leonid

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...

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Boris Bikes/Barclays Cycle Hire Average Journey Times

January 6, 2011
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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 the City of London, whilst ...

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a survey on ABC

January 6, 2011
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a survey on ABC

With Jean-Michel Marin, Pierre Pudlo and Robin Ryder, we just completed a survey on the ABC methodology. It is now both arXived and submitted to Statistics and Computing. Rather interestingly, our first draft was written in Jean-Michel’s office in Montpelier by collating the ‘Og posts surveying new ABC papers! (Interestingly because this means that my

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formatR update (0.1-6)

January 6, 2011
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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 'text' to accept a character vector

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