Posts Tagged ‘ R-english ’

Open data and ecological fallacy

April 28, 2012
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Open data and ecological fallacy

A couple of days ago, on Twitter, @alung mentioned an old post I did publish on this blog about open-data, explaining how difficult it was to get access to data in France (the post, published almost 18 months ago can be found here, in French)....

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Short versus long papers, in academic journals

April 24, 2012
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Short versus long papers, in academic journals

This Monday, during my talk on quantile regressions (at the Montreal R-meeting), we've seen how those nice graphs could be interpreted, with the evolution of the slope of the linear regression, as a function of the probability level. One illustrati...

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Talk on quantiles at the R Montreal group

April 23, 2012
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Talk on quantiles at the R Montreal group

This afternoon, I will be giving a two-hour talk at McGill on quantiles, quantile regressions, confidence regions, bagplots and outliers. Before defining (properly) quantile regressions, we will mention regression on (local) quantiles, as on the gr...

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Nonconvexity, and playing indoor paintball

April 6, 2012
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Nonconvexity, and playing indoor paintball

Following the two previous posts (here and there), on the number of people that don't get wet while playing with water pistols, consider now an indoor version, in a non-convex room (i.e. player behind wall are now, somehow, protected). In the previ...

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Where hiding if you don’t want to get wet ?

April 5, 2012
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Where hiding if you don’t want to get wet ?

Following the previous post, two additional remarks. Following a comment by @cosi, I have investigated quickly a binomial fit to the distribution of the number of people not getting wet, with a fixed number of players on the field. It looks like it...

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Playing with fire (or water)

April 2, 2012
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Playing with fire (or water)

A few days ago, http://www.futilitycloset.com/ published a short post based on the fourth problem of the 1987 Canadian Mathematical Olympiad (from on a problem from the 6th All Soviet Union Mathematical Competition in Voronezh, 1966). The problem i...

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Sunday evening, stupid games…

April 1, 2012
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Sunday evening, stupid games…

This evening, while I was about to wash the dishes, I heard my elders starting a game (call them Him and Her) Him: "I have picked - in my head - a number, lower than 50. Try to guess..." Her: "No way, too difficult..." Him: "You can try five differ...

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Maths can be cool (to impress your kids)

March 30, 2012
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Maths can be cool (to impress your kids)

Just imagine that your kids need some help, to prepare fishes for April 1st, like Her: "please, Daddy, help us to draw some fishes" Me: "Sure, Daddy is a champion, actually, I do that everyday at work: drawing fishes - and more generally nice stuf...

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Ruin probability and infinite time

March 27, 2012
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Ruin probability and infinite time

A couple of weeks ago, I had a discussion with a practitioner, working in some financial company, about ruin, and infinite time. And it remind me a weird result. Well, not a weird result, but a result I found disturbing, at first, when I was a stud...

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Do we appreciate sunbathing in Spring ?

March 22, 2012
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Do we appreciate sunbathing in Spring ?

We are currently experiencing an extremely hot month in Montréal (and more generally in North America). Looking at people having a beer, and starting the first barbecue of the year, I was wondering: if we asked people if global warming was a good ...

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