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Wilcoxon Champagne test

June 14, 2011
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Wilcoxon Champagne test

As an appetizer for Paris triathlon, Jérôme and I ran as a team last week-end an adventure racing in Champagne region (it mainly consists in running, cycling, canoeing, with a flavor of orienteering, and Champagne is kept for the end). It was organized by Ecole Polytechnique students who, for the first time, divided Saturday’s legs

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RStudio Beta 3 (v0.94)

June 14, 2011
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RStudio Beta 3 (v0.94)

RStudio Beta 3 (v0.94) is available for download today. The goal for this release was to refine and improve our core features based on the feedback we’ve gotten on our first two betas. Highlights of the new release include: Source editor enhancements — New editor features include brace/paren/quote matching, more intelligent cursor placement after newlines, function

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No lake is an island: PhD Opportunity

June 14, 2011
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No lake is an island: PhD Opportunity

NERC recently funded the formation of the UK Lake Ecological Observation Network (UKLEON) as part of the its Networks of Sensors programme. UKLEON is lead by Ian Jones at CEH Lancaster. A fully-funded PhD project is associated with the UKLEON … Continue reading →

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Using simulation to demonstrate theory: Hardy-Weinberg Equilibrium

June 13, 2011
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Using simulation to demonstrate theory: Hardy-Weinberg Equilibrium

One of my teaching roles is in an introductory Genetics course, where first year students are presented with a wide range of new ideas at a relatively fast pace.  It seems that often, students choose to take a memorization approach to learning the material, rather than taking the chance to think about how and why

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Additive modelling and the HadCRUT3v global mean temperature series

June 12, 2011
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Additive modelling and the HadCRUT3v global mean temperature series

Earlier, I looked at the HadCRUT3vgl data set using generalized least squares to investigate whether the trend in temperature since 1995 was statistically significant. Here I want to follow-up one of the points from the earlier posting; namely using a … Continue reading →

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Global warming since 1995 ‘now significant’

June 11, 2011
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Global warming since 1995 ‘now significant’

Yesterday (June 11, 2011) the BBC reported on comments by Prof. Phil Jones, of the Climatic Research Unit (CRU), University of East Anglia (UEA), that the warming experienced by the planet since 1995 was statistically significant. That the trend in … Continue reading →

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What is ordisurf() doing…?

June 10, 2011
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What is ordisurf() doing…?

I’m writing this post for two reasons: i) someone searched on Google for the term “what is ordisurf doing” and ended up on my blog, and ii) because I have been on the receiving end of reviewers comments on a … Continue reading →

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Cross de Bercy 2011 [v2&3]

June 10, 2011
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Cross de Bercy 2011 [v2&3]

Following my (un)reasonable time last year, I registered again for the annual “Cross de Bercy”  run by the Sport Club of the Finance Ministry (with whom/which CREST is affiliated). This is a two loop 10km race taking

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Rotating disks

June 9, 2011
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Rotating disks

My neighbour is an half-retired entrepreneur who still runs his electric engine company. A few weekends ago, he came to me with the following physics question related with one of those engines: given a primary disk rotating at the angular speed of ω0 and a secondary disk located on the first one with a centre

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gridExtra – Multiple plots from ggplot2

June 8, 2011
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gridExtra – Multiple plots from ggplot2

Thanks to this great post http://www.imachordata.com/?p=730 we can now put multiple plots on a display with ggplot2. This provides somewhat similar functionality to ‘par(mfrow=c(x,y))’ which would allow multiple plots with the base plot function. gridExtra doesn’t have quite the same level of options as ‘par’, but the syntax is simple. grid.arrange( graph1, graph2, ncol=2 Simple. ‘grid.table’

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