Posts Tagged ‘ R-english ’

Infidelity and econometrics

January 17, 2012
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Infidelity and econometrics

On http://www.bakadesuyo.com, there was recently an interesting discussion about infidelity, the key question being "at what ages are men and women most likely to have affairs?" The discussion is based on some graphs, e.g. The source is a paper b...

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MAT8886 Fisher-Tippett theorem and limiting distribution for the maximum

January 12, 2012
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MAT8886 Fisher-Tippett theorem and limiting distribution for the maximum

Tomorrow, we will discuss Fisher-Tippett theorem. The idea is that there are only three possible limiting distributions for normalized versions of the maxima of i.i.d. samples . For bounded distribution, consider e.g. the uniform distribution on t...

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Maps with R, and polygon boundaries

December 21, 2011
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Maps with R, and polygon boundaries

With R, it is extremely easy to draw maps. Let us start with something simple, like French regions. Baptiste mentioned on his blog that shapefiles can be downloaded from http://ign.fr/ website. Hence, if you extract the zip file, it is possible to ...

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PhD defense on copulas

November 15, 2011
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(This article was first published on Freakonometrics - Tag - R-english, and kindly contributed to R-bloggers) To leave a comment for the author, please follow the link and comment on their blog: Freakonometrics - Tag - R-english. R-bloggers.com offers daily e-mail updates about R news and tutorials on topics such as: Data science, Big Data, R jobs, visualization (ggplot2,...

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Conference in Lyon on climate change and insurance

November 14, 2011
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Conference in Lyon on climate change and insurance

I will be in Lyon next Monday to give a talk on "Modeling heat-waves: return period for non-stationary extremes" in a workshop entitled "Changement climatique et gestion des risques". An interesting reference might be some pages from Le Monde (201...

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Confidence interval for predictions with GLMs

November 4, 2011
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Confidence interval for predictions with GLMs

Consider a (simple) Poisson regression . Given a sample where , the goal is to derive a 95% confidence interval for given , where is the prediction. Hence, we want to derive a confidence interval for the prediction, not the potential observation...

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Strange behavior of correlation estimation

November 2, 2011
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Strange behavior of correlation estimation

The Gaussian vector is extremely interesting since it remains Gaussian when conditioning. More precisely, if is a Gaussian random vector, then the conditional distribution of is also Gaussian. Further, it is possible to derive explicitly the cova...

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Consecutive number and lottery

October 25, 2011
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Consecutive number and lottery

Recently, I have been reading odd things about strategies to win at the lottery. E.g. or I wrote something a long time ago, but maybe it would be better to write another post. First, it is easy to get data on the French lotteries, including dra...

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Short selling, volatility and bubbles

October 17, 2011
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Short selling, volatility and bubbles

Yesterday, I wrote a post (in French) about short-selling in financial market since some journalists claimed that it was well-known that short -selling does increase volatility on financial market. Not only in French speaking journals actually, sin...

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vectorplot in rasterVis

October 2, 2011
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vectorplot in rasterVis

The function slopeAspect from raster provides the vector field (gradient) from a scalar field stored in a RasterLayer object. The magnitude (slope) and direction (aspect) of the vector field is usually displayed with a set of arrows (e.g. quiver in Matlab). rasterVis includes now a method, vectorplot, to calculate and display this vector field

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