August 2008

UseR!2008 aftermath

August 30, 2008 | Michal

Earlier in August I was on the R user conference which this year took place in Dortmund. It was a quite an exciting event gathering around 500 people from around the globe and featuring 170 presentations and talks. Topics varied from new developments in the R system, newly implemented statistical methods as ... [Read more...]

R Design Flaws #1 and #2: A Solution to Both?

August 25, 2008 | Radford Neal

I’ve previously posted about two design flaws in R. The first post was about how R produces reversed sequences from a:b when a__b, with bad consequences in “for” statements (and elsewhere). The second post was about how R by default drops dimensions in expressions like M[i:... [Read more...]

More stats sites

August 20, 2008 | John Johnson

Jim Albert has a blog based on his book Bayesian Computation in R. Unfortunately, it seems they haven't been updating it too much recently but it looks like what's there is pretty good. [Read more...]

Visualize Copulas

August 20, 2008 | Quantitative Finance Collector

In those Copula codes you can get a rough idea what copula is, how to estimate and simulate it, how to test its performance, etc., to help you visualize what on earth the copula should look like, below R code draws plots of some widely used copulas.ht... [Read more...]

Design Flaws in R #2 — Dropped Dimensions

August 19, 2008 | Radford Neal

In a comment on my first post on design flaws in the R language, Longhai remarked that he has encountered problems as a result of R’s default behaviour of dropping a dimension of a matrix when you select only one row/column from that dimension. This was indeed the ... [Read more...]

Updated version of GGobi: 2.1.8

August 12, 2008 | Hadley Wickham

We've just posted an updated version of GGobi - version 2.1.8. This version fixes a number of small bugs, particularly with theDescribeDisplay plugin. If you are on windows, make sure to also update to the latest version of gtk linked from the downlo... [Read more...]

Process Simulation in R

August 12, 2008 | Quantitative Finance Collector

Simple demonstration codes for process simulation in R, including Brownian motion simulation, Poisson process simulatio, Euler scheme simulation for Geometric Brownian motion, the mean-reverting process, and the process with two 'attractors', etc.http... [Read more...]

Link C with R

August 7, 2008 | Yu-Sung Su

I should have posted this earlier. In my previous post, I have discussed the speed issue in R briefly. The speed issue unfortunately are two of the shortcomings of R. The other one is that R does not handle big data set very well. So instead of wai... [Read more...]

Design Flaws in R #1 — Reversing Sequences

August 6, 2008 | Radford Neal

The R language for statistical computing has become the standard for academic statistical research, for the very good reason that it’s better than the alternatives. It’s far from perfect however. I could come up with a long “wish list” of desired features it lacks, but that’s not ... [Read more...]

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