Posts Tagged ‘ R-english ’

Generating a quasi Poisson distribution, version 2

November 10, 2010
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Generating a quasi Poisson distribution, version 2

Here and there, I mentioned two codes to generated quasiPoisson random variables. And in both of them, the negative binomial approximation seems to be wrong. Recall that the negative binomial distribution is where and in R, a negative binomial di...

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Updating meteorological forecasts, part 1

November 7, 2010
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Updating meteorological forecasts, part 1

As Mark Twain said "the art of prophecy is very difficult, especially about the future" (well, actually I am not sure Mark Twain was the  first one to say so, but if you're interested by that sentence, you can look here). I have been rather su...

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Pretty R code in the blog

November 5, 2010
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Pretty R code in the blog

David Smith (alias @revodavid, see also on the Revolutions blog, here) pointed out that my R code was not easy to read (not only due to my computing skills, but mainly because of the typography I use). He suggested that I use the Pretty R tool (her...

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Splines: opening the (black) box…

November 4, 2010
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Splines: opening the (black) box…

Splines in regression is something which looks like a black box (or maybe like some dishes you get when you travel away from home: it tastes good, but you don't what's inside... even if you might have some clues, you never know for sure*). With spl...

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My residuals look weird… aren’t they ?

November 3, 2010
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My residuals look weird… aren’t they ?

Since I got the same question twice, let us look at it quickly....  Some students show me a graph (from a Poisson regression) which looks like that, and they asked "isn't it weird ?", i.e."residuals are null or positive... this is not what we...

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Comments on probabilities

November 2, 2010
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Comments on probabilities

The only thing I remember from courses I had in probability a few years ago is that we also have to clearly defined the event we want to calculate the probability. On the Freakonomics blog, last week, the Israeli lottery was mentioned (here, see a...

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Names of villages, in France

November 2, 2010
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Names of villages, in France

Keith Briggs published a post here on names of English place name element distribution, which contains almost twenty maps like the one where names ends by -bourn,bourne,burn (here) or -head (there). Actually, it is possible (Robin mentioned that a...

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How to simulate wind speed time series with R

November 2, 2010
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How to simulate wind speed time series with R

If you need to generate synthetic wind speed time series, you may find useful the procedure described in  “A Markov method for simulating non-gaussian wind speed time series” by G.M. McNerney and P.S. Veers (Sandia Laboratories, 1985), and “Estimation of extreme wind speeds with very long return periods” by M.D.G Dukes and J.P. Palutikof (Journal

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A million ? what are the odds…

October 27, 2010
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A million ? what are the odds…

50 days ago, I published a post, here, on forecasting techniques. I was wondering what could be the probability to have, by the end of this year, one million pages viewed (from Google Analytics) on this blog. Well, initially, it was on my blog at t...

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Margin of error, and comparing proportions in the same sample

October 15, 2010
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Margin of error, and comparing proportions in the same sample

I recently tried to answer a simple question, asked by @adelaigue. Actually, I thought that the answer would be obvious... but it is a little bit more compexe than what I thought. In a recent pool about elections in Brazil, it was mentionned in a ...

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