February 2010

Visualize dynamic data from R in 3d

February 17, 2010 | » R

In this video i demonstrate a nice feature of Bio7 to visualize 3d data created in “R” dynamically. The data for the points is generated in “R” and then transferred to the OpenGL view of Bio7. In the first example a random plot is generated and updated. In the second ... [Read more...]

Generalized linear mixed effect model problem

February 16, 2010 | Shige

I am trying to compare cohort difference in infant mortality using generalized linear mixed model. I first estimated the model in Stata:xi:xtlogit inftmort i.cohort, i(code)which converged nicely:Fitting comparison model:Iteration 0:   log likelih...
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How to make a mosaic plot in R

February 16, 2010 | David Smith

Mosaic plots (aka treemaps) are a great way to visualize hierarchical data. A collection of rectangles represents all the elements to be visualized (customers, news items, blog posts), with the size and color of the rectangles coding attribute. But what makes this chart unique is the arrangement of the elements: ... [Read more...]

A Case Study in Optimising Code in R

February 16, 2010 | Jeromy Anglim

This post presents an experience I had optimising the efficiency of code for a data analysis task in R. I'm not an expert in programming nor code optimisation. However, I thought my experience might make an interesting case study for others at a simila...
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Sugar price seasonality

February 16, 2010 | kafka

Recently, Orion securities have issued a “BUY” recomendation for Cugar ETF. Because, neither I follow the recommendations nor I’m big fan of TA (I have to admit, that I was…), I decided to check sugar price seasonality. Voila, the mean of monthly returns are presented in the graph. February, ... [Read more...]

Using Google Reader

February 15, 2010 | Rob J Hyndman

Google Reader is a fantastic way to keep track of new papers that are appearing in many different journals, and also to follow some of the interesting research blogs (and blogs on other topics) that are out there. Google Reader checks websites for you and lets you know of any ...
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Two-way Analysis of Variance (ANOVA)

February 15, 2010 | Ralph

The analysis of variance (ANOVA) model can be extended from making a comparison between multiple groups to take into account additional factors in an experiment. The simplest extension is from one-way to two-way ANOVA where a second factor is included in the model as well as a potential interaction between ...
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R vs. Matlab – a small example

February 15, 2010 | nattomi

At the institute I’m working quite a lot of people prefer using Matlab and only a few of them know about R. Today one of my colleagues — who is also an eager user of Matlab — ran into the following problem: He had a vector in hand which consisted of ... [Read more...]

Rcpp 0.7.7

February 14, 2010 | romain francois

pre{ border: 1px solid black ; font-size: small ; } A good 2 days after 0.7.6 was released, here comes Rcpp 0.7.7. The reason for this release is that a subtle bug installed itself and we did not catch it in time The new version also includes ... [Read more...]

Cure model using R

February 13, 2010 | Shige

The package "nltm" seems to be able to estimate proportional hazard and proportional odds cure models. I will do some experiments and see how it goes.
[Read more...]

Rcpp 0.7.6

February 13, 2010 | Thinking inside the box

The new 0.7.6 release of Rcpp, our set of R / C++ interface classes, is now at CRAN and Debian. This comes just a few days after 0.7.5 as we had made a mistake in Makefile.win which is now fixed. A few other things sneaked in while were at it, see th... [Read more...]

highlight 0.1-5

February 13, 2010 | romain francois

pre{ border: 1px solid black ; font-size: small; } I've pushed the version 0.1-5 of highlight to CRAN, it should be available in a couple of days. This version fixes highlighting of code when one wants to display the prompt and the continue pr... [Read more...]

Introduce your friends to R

February 12, 2010 | Jim

http://blog.revolution-computing.com/2010/01/introduce-your-friends-to-r.htmlhttp://www.typepad.com/services/trackback/6a010534b1db25970b0120a7ed6fd2970b [Read more...]
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