structure and uncertainty, Bristol, Sept. 26

September 26, 2012 | xi'an

Another day full of interesting and challenging—in the sense they generated new questions for me—talks at the SuSTain workshop. After another (dry and fast) run around the Downs; Leo Held started the talks with one of my favourite topics, namely the theory of g-priors in generalized linear models. ... [Read more...]

the Wang-Landau algorithm reaches the flat histogram in finite time

October 19, 2011 | xi'an

Pierre Jacob and Robin Ryder (from Paris-Dauphine, CREST, and Statisfaction) have just arXived (and submitted to the Annals of Applied Probability) a neat result on the Wang-Landau algorithm. (This algorithm, which modifies the target in a sort of reweighted partioned sampling to achieve faster convergence, has always been perplexing to ... [Read more...]


July 6, 2011 | Oscar Perpiñán Lamigueiro

The raster package defines classes and methods for spatial raster data access and manipulation. The new rasterVis package complements raster providing a set of methods for enhanced visualization and interaction. It is now at CRAN. Several examples can ... [Read more...]

solaR 0.24 at CRAN

June 17, 2011 | Oscar Perpiñán Lamigueiro

The version 0.24 of solaR is at CRAN and R-Forge. Some days before the 0.23 version was uploaded, but I had to make a quick fix to readMAPA: the url of has been changed to Moreover, this function has been renamed to ... [Read more...]

another look at CRAN Task Views

May 26, 2011 | Nick Horton

We've been impressed with how helpful the CRAN Task Views are in guiding us in R as we wend our way through the huge number of add-on packages (3021 as of May, 2011). These are web pages that are maintained by volunteers with expertise in a specified ...
[Read more...]

Mixed models – Part 2: lme lmer

February 15, 2011 | nzcoops

Getting more into mixed models, I’ve been playing around with both nlme::lme and lme4::lmer. was quite a good post at explaining the differences, which from what I gather is largely performance based when using crossed or partially crossed ... [Read more...]

formatR update (0.1-6)

January 6, 2011 | Yihui Xie

A new version of the formatR package is available on CRAN now (binary packages are still on the way). There are three major updates: the inline comments will also be preserved in most cases (in earlier versions, only single lines of comments are preserved) tidy.source() gained a new argument ... [Read more...]

New version of solaR (0.21)

December 9, 2010 | procomun

The version 0.21 of the solaR package is now available at CRAN. This package provides a set of calculation methods of solar radiation and performance of photovoltaic systems. The package has been uploaded to CRAN under the GPL-3 license. solaR is now able to calculate from both daily and sub-daily irradiation ... [Read more...]

Rcpp 0.8.9

November 28, 2010 | romain francois

Rcpp 0.8.9 was pushed to CRAN recently. Apart from minor bug fixes, this release concentrates on modules, with lots of new features to expose C++ functions and classes through R reference classes. The Rcpp-modules vignette has all the details, a... [Read more...]

Pretty R code in the blog

November 5, 2010 | arthur charpentier

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... [Read more...]

A million ? what are the odds…

October 27, 2010 | arthur charpentier

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... [Read more...]
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