December 2010

All together now – Confirmatory Factor Analysis in R

December 8, 2010 | gerhi

Describing multivariate data is not easy. Especially, if you think that statisticians have not developed any new tools after the ANOVA and principal component analysis (PCA). For social and experimental scientists the most important new technique are structural equation models that combine measurement models (that substitute reliability analysis and PCA) ... [Read more...]

Slides from Revolution R: 100% R and More

December 8, 2010 | David Smith

If you missed today's webcast on Revolution R Enterprise: 100% R and more, the slides from the presentation are now available for download, and a replay of the webcast (in WMV format) will be available at that same link very soon. And if you missed some of the links I mentioned ... [Read more...]

New paper: Survival analysis

December 8, 2010 | csgillespie

Each year I try to carry out some statistical consultancy to give me experience in other areas of statistics and also to provide teaching examples. Last Christmas I was approached by a paediatric consultant from the RVI who wanted to carry out prospective survival analysis. The consultant, Bruce  Jaffray, had ... [Read more...]

Fantasy football (oops, soccer)

December 8, 2010 | prasoonsharma

Recently a colleague asked if I could use R/statistics to form a dream soccer team from a pool of soccer players, given basic player information like name, club, cost, points.The idea is to form a team with your preferred configuration of number of def...
[Read more...]

Google AI Challenge: Scores/Rank by Language

December 8, 2010 | C

A quick follow up to the previous post: about the the scores in the 2010 Google AI competition relative to programming language.  The chart above makes each language visible and discrete - and the scales are the same.library(ggplot2)df [Read more...]

inline 0.3.8

December 7, 2010 | Thinking inside the box

Romain pushed verion 0.3.8 of inline to CRAN earlier today, and I just updated the Debian package. This version adds an internal performance enhancement which is obtained by making due with fewer reads. The short NEWS file entry follows: 0.3.8 2... [Read more...]

R Workflow

December 7, 2010 | Daniel Hocking

When working with R you end up using a large number of datasets, packages, functions, objects, output files, workspaces, etc.  It can get a bit overwhelming trying to keep everything organized.  That is why a consistent, well-organized workf...
[Read more...]

Bayesian model selection

December 7, 2010 | xi'an

Last week, I received a box of books from the International Statistical Review, for reviewing them. I thus grabbed the one whose title was most appealing to me, namely Bayesian Model Selection and Statistical Modeling by Tomohiro Ando. I am indeed interested in both the nature of testing hypotheses or ... [Read more...]

Build RQuantLib on 32-bit Windows

December 7, 2010 | Joshua Ulrich

Before you start, note that there is now a Windows binary of RQuantLib is available on CRAN.Due to a change in how R-2.12.0 is built, CRAN maintainers could no longer provide a Windows binary of RQuantLib with the QuantLib library they had been using.... [Read more...]

Webinar: Revolution R is 100% R and More

December 7, 2010 | David Smith

I'll be hosting a webinar tomorrow (Wednesday) aimed at R users who want to know more about how Revolution R Enterprise extends open source R for big data, Web services, multi-core processing, debugging and more. For R users at schools and universities, I'll also explain how you can download and ... [Read more...]

Sequential Line Plots in R

December 7, 2010 | gjabel

I was trying to create some sequential plots today in R to analyse some MCMC simulations. I found the par(ask=TRUE) command very useful for looking at iterations of individual parameter values. Setting the ask graphical parameter to TRUE (before a … Continue reading → [Read more...]

Webinar on Revolution R Enterprise

December 7, 2010 | Stephen Turner

R evangelist David Smith, marketing VP at Revolution R, will be giving a webinar showing off some of the finer features of Revolution R Enterprise - an integrated development environment (IDE) for R that has an enhanced script editor with syntax highli... [Read more...]

Le Monde puzzle [49]

December 7, 2010 | xi'an

Here is a quick-and-dirty solution to Le Monde puzzle posted a few days ago: the R code counts the number of winning tickets between 1 and N, and stops when there is a proportion of 10% of winning tickets. #winning ticket win=function(n){ #decimal digits decomposition x=rep(0,4) x[4]=n%%10 m=(... [Read more...]
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