Publications by arthur charpentier
Maps with R, part… n+1
Following the idea posted on James Cheshire’s blog (here), I have tried to play a little bit with R and Google. And it works ! Consider for instance life expectancy at birth (that can be found – and downloaded – here). Using the following code, it is possible to generate an R graph in a web page, install.packages("googleVis") library(google...
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More climate extremes, or simply global warming ?
In the paper on the heat wave in Paris (mentioned here) I discussed changes in the distribution of temperature (and autocorrelation of the time series). During the workshop on Statistical Methods for Meteorology and Climate Change today (here) I observed that it was still an important question: is climate change affecting only averages, or does ...
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Warming in Paris: minimas versus maximas ?
Recently, I received comments (here and on Twitter) about my previous graphs on the temperature in Paris. I mentioned in a comment (there) that studying extremas (and more generally quantiles or interquantile evolution) is not the same as studying the variance. Since I am not a big fan of the variance, let us talk a little bit about extrema behav...
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Will I ever be a bayesian statistician ? (part 1)
Last week, during the workshop on Statistical Methods for Meteorology and Climate Change (here), I discovered how powerful bayesian techniques could be, and that there were more and more bayesian statisticians. So, if I was to fully understand applied statisticians in conferences and workshops, I really have to understand basics of bayesian stati...
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Open data might be a false good opportunity…
I am always surprised to see many people on Twitter tweeting about #opendata, e.g. @data4all, @usdatagov, @datapublicatwit, @ProPublica or @open3 among so many others… Initially, I was also very enthousiastic, but I have to admit that open data are rarely raw data. Which is what I am usually looking for, as a statistician… Con...
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Think academic journals look the same ? Well, some do…
We have seen yesterday that finding an optimal strategy to publish is not that simple. And actually, it can be even more difficult in the case the journal rejects the paper (not because it is not correct, but because “it does not fit” with the standards, the quality of the journal, the audience, the editor’s mood, or whateve...
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When will my papers appear as references (if they do…) ?
Following my post on citations in academic journals, I wanted to go one step further in the understanding of the dynamic of citations. So here, the dataset looks like that: for each article, we have the name of the journal, the year of publication (also the title of the article, but here we do not use it, as well as the authors), and more interes...
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What is the optimal strategy to marry the best one ?
Valentine’s day is a nice opportunity to post on hot and sexy topics… Well, it’s also an important day that I should not miss, probably as much as Saint Patrick’s my wife’s birthday. And as I mentioned last week (here), it is difficult to get the distribution of the age of marriage on the internet… So maybe we can build up a small mod...
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Does the Student based confidence interval have any interest in practice ?
Friday in the course of statistics, we started the section on confidence interval, and like always, I got a bit confused with the degrees of freedom of the Student (should it be or ?) and which empirical variance (should we consider the one where we divide by or the one with ?). And each time I start to get confused, the student obviously se...
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when Nuns or Hells Angels get in a plane
Today, at lunch, Matthieu told us a nice story (or call it a paradox if you like) about the probability to find you seat empty when you get in a place. a plane full of nuns Assume that you are in the line to get in the airplane, you are the 100th in the line. The first one is scatter brained, he has his head in the clouds, and when he get in t...
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