Publications by xi'an
Core in CiRM [2]
We are making slow progress on the normal and regression chapters as we decided to write the package at the same time we revise the chapters… Jean-Michel transformed the variable selection and model choice R codes of the regression chapter into generic functions that will fit within the package. I rewrote the section on testing, removing all co...
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CoRe in CiRM [3]
Still drudging along preparing the new edition of Bayesian Core. I am almost done with the normal chapter, where I also changed the Monte Carlo section to include specific tools (bridge) for evidence/Bayes factor approximation. Jean-Michel has now moved to the new hierarchical model chapter and analysed longitudinal datasets that will constit...
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A quantum leap (CoRe in CiRM [4])
Today, as I was trying to install SpatialEpi to use the Scotland lip cancer data in the last chapter of Bayesian Core, I realised my version of R, R Version 2.6.1, was hopelessly out of date! As I am also using Hardy Heron, a somehow antiquated version of Ubuntu on my Mac, upgrading R took some effort as well. I eventually found that adding t...
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Multidimension bridge sampling (CoRe in CiRM [5])
Since Bayes factor approximation is one of my areas of interest, I was intrigued by Xiao-Li Meng’s comments during my poster in Benidorm that I was using the “wrong” bridge sampling estimator when trying to bridge two models of different dimensions, based on the completion (for and missing from the first model) When revising the normal c...
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CoRe in CiRM [6]
This is the last day at CiRM for our “research in pair” working on the new edition of Bayesian Core. I mostly completed the revision of the chapter on Bayesian imaging, including stuff on Markov random fields and mainly on ABC algorithms. All that remains to be done about this chapter is the processing of the Scottish lip cancer dataset ...
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CoRe in CiRM [end]
Back home after those two weeks in CiRM for our “research in pair” invitation to work on the new edition of Bayesian Core, I am very grateful for the support we received from CiRM and through it from SMF and CNRS. Being “locked” away in such a remote place brought a considerable increase in concentration and decrease in stress leve...
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The wonderful world of vim
When searching for a way to recover control carriage return symbols ^M into genuine ones (under vim), I found this handy page of vim tips. And then saw that the enthusiastic author had even a blog about vim! Obviously, this post will be meaningless for all readers not aware of the joys of the vim editor, so let me stress that “vim is a highly c...
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Bugs [genuine]
Nothing related with programming, I am afraid! Just a few bugs visiting my passion vine… I find the green bugs quite interesting with their back “engravings”, even though they are most likely pests … Filed under: pictures, R Tagged: BUGS, ladybug, passion vine Related To leave a comment for the author, please follow the link an...
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Asher’s enigma
On his Probability and statistics blog, Matt Asher put a funny question (with my rephrasing): Take a unit square. Now pick two spots at random along the perimeter, uniformly. For each of these two locations, pick another random point from one of the three other sides of the square and draw the segment. What is the probability the two segments...
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A summer of books
The summer started with a research in pair session in CiRM on the R edition of Bayesian Core, but I am also involved two other book projects. The first one was mentioned in a previous post, namely the translation of Introducing Monte Carlo Methods with R into French. I have now recovered all translated chapters, involving not less than si...
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