January 2008

New material on the GGobi book web page

January 30, 2008 | Di Cook

The GGobi book is now available from Springer and Amazon, after quite a delay. Getting the figures printed correctly was difficult. Solutions to the exercises in the back of each chapter are available for instructors by emailing Springer.The movies on ... [Read more...]

Shading overlapping area of curves in R

January 28, 2008 | Yu-Sung Su

I was trying to plot figure in R like the one below, which is basically the veto player model of Tsebelis. Based on my knowledge of R now, I encountered 2 major problems:I don't know if there is a function that can draw archs, or at least partial curves from ... [Read more...]

Heuristics for statistics

January 28, 2008 | dan

SIMPLE WAYS TO DETECT AND COMMUNICATE STATISTICAL EFFECTS Decision Science News is fond of heuristics and the Simonian view that for many problems organisms face, optimization is a fiction and satisficing makes us smart. Statistics is an area in which it is easy to see precision that isn’t there ...
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Hack-at-it 2007

January 28, 2008 | Di Cook

The GGobi Hack-at-it 2007 was held just before useR! 2007 in Ames Iowa.The main focus this year was on the data pipeline again, and on pipelines in other software.Several projects were discussed: the geometric shapes, high-dimensional games, local neig... [Read more...]

ERGMs in R

January 23, 2008 | Michal

Developers of statnet, a collection of packages for R for fitting Exponential Random Graph Models (ERGM), issued a major update. First change is that the main package is now called ergm. Secondly, a set of additional packages has been made available. Apart from package network, that provides a class system ... [Read more...]

Resources for S4 classes and methods

January 23, 2008 | Michal

Learning the programming in the new S4 system of classes and methods in R can be quite cumbersome, even though the methods package is very well documented. That is why I collected some of the info and materials that I am aware of on a separate page here. I warmly ... [Read more...]

GillespieSSA 0.5-1 is released

January 15, 2008 | Mario Pineda-Krch

I just uploaded GillespieSSA 0.5-1 to CRAN. Now it’s just a matter of days before it has propagated itself across all CRAN mirrors. This version consists primarily of revisions I made in response to the reviewer comments on the paper … Continue reading → [Read more...]

Quantile regression in R

January 5, 2008 | dataninja

Roger Koenker, a quantile regression crusader, has an R package that implements the procedure. It is called quantreg, and it is documented here. This package has apparently been around for quite some time, but I was only recently turned on to quantile ... [Read more...]

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