Blog Archives

Optimization

June 22, 2013
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Optimization

Many problems in statistics or machine learning are of the form "find the values of the parameters that minimize some measure of error". But in some cases, constraints are also imposed on the parameters: for instance, that they should sum up to 1, or that at most 10 of them should be non-zero -- this adds a combinatorial layer to the...

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Use R 2009 Conference

October 16, 2009
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Use R 2009 Conference

I did not attend the conference this year, but just read through the presentations. There is some overlap with other R-related conferences, such as R in Finance or the Rmetrics workshop. http://www.agrocampus-ouest.fr/math/useR-2009/ http://www.rinfina...

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Statistics with R

January 7, 2007
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I have just uploaded the new version of my "Statistics with R": http://zoonek2.free.fr/UNIX/48_R/all.htmlThe previous version was one year and a half old, so in spite of the fact I have not had much time to devote to it in the past two years, it might ...

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The grammar of graphics (L. Wilkinson)

October 21, 2006
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The grammar of graphics (L. Wilkinson)

Though this book is supposed to be a description of the graphics infrastructure a statistical system could provide, you can and should also see it as a (huge, colourful) book of statistical plot examples. The author suggests to describe a statistical ...

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R graphics

August 13, 2006
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R graphics

I just finished reading Paul Murrel's book, "R graphics". There are two graphical systems in R: the old ("classical" -- in the "graphics" package) one, and the new ("trellis", "lattice", "grid" -- in the "lattice" and "grid" packages) one. The first p...

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useR! 2006

June 26, 2006
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Last week, I attended the 2006 UseR! conference: here is a (long) summary of some of the talks that took place in Vienna -- since there were up to six simultaneous talks, I could not attend all of them... In this note: 0. General remarks 1. Tutorial: B...

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