February 2010

Visualize dynamic data from R in 3d

February 17, 2010 | 0 Comments

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 | 0 Comments

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...
[Read more...]

How to make a mosaic plot in R

February 16, 2010 | 0 Comments

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...]

You can Hadoop it! It’s elastic! Boogie woogie woog-ie!

February 16, 2010 | 0 Comments

I just came back from the future and let me be the first to tell you this: Learn some Chinese. And more than just cào nǐ niáng (肏你娘) which your friend in grad school told you means “Live happy with many blessings”. Trust me, I’ve been hanging with ...
[Read more...]

A Case Study in Optimising Code in R

February 16, 2010 | 0 Comments

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...
[Read more...]

Sugar price seasonality

February 16, 2010 | 0 Comments

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 | 0 Comments

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 ...
[Read more...]

Two-way Analysis of Variance (ANOVA)

February 15, 2010 | 0 Comments

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 ...
[Read more...]

R vs. Matlab – a small example

February 15, 2010 | 0 Comments

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...]

Bay Area meet-up Tuesday: John Chambers speaks, cocktail reception

February 15, 2010 | 0 Comments

At tomorrow's meeting of the Bay Area R User's Group, ACM Software Systems award winner and R Core Group member John Chambers will give a keynote talk on the R language. The talk, titled Interfaces and Paradigms, will explore choices for computing with data with visits along the way to ... [Read more...]

Rcpp 0.7.7

February 14, 2010 | 0 Comments

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 | 0 Comments

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 | 0 Comments

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 | 0 Comments

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...]

Exact Complexity of Mergesort, and an R Regression Oddity

February 13, 2010 | 0 Comments

It’s nice to be back after a pretty crazy two weeks or so. Let me start off by stating that this blog post is simply me pondering and may not be correct. Feel free to comment on inaccuracies or improvements! In preparation for an exam and my natural tendencies ... [Read more...]

Introduce your friends to R

February 12, 2010 | 0 Comments

http://blog.revolution-computing.com/2010/01/introduce-your-friends-to-r.htmlhttp://www.typepad.com/services/trackback/6a010534b1db25970b0120a7ed6fd2970b [Read more...]
1 2 3 4 5 6 7

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)