Blog Archives

R-Node: a web front-end to R with Protovis

April 3, 2010
By
R-Node: a web front-end to R with Protovis

Update (April 6 – 2010) : R-Node now has it’s own a website, with a dedicated google group (you can join it here) * * * * The integration of R into online web services is (for me) one of the more exciting prospects in R’s future. That is way I was very excited coming across Jamie...

Read more »

Quantile LOESS – Combining a moving quantile window with LOESS (R function)

April 1, 2010
By
Quantile LOESS – Combining a moving quantile window with LOESS (R function)

In this post I will provide R code that implement’s the combination of repeated running quantile with the LOESS smoother to create a type of “quantile LOESS” (e.g: “Local Quantile Regression”). This method is useful when the need arise to fit robust and resistant (Need to be verified) a smoothed line for a quantile (an example for such a...

Read more »

The “Future of Open Source” Survey – an R user’s thoughts and conclusions

March 23, 2010
By
The “Future of Open Source” Survey – an R user’s thoughts and conclusions

Over a month ago, David Smith published a call for people to participate in the “Future of Open Source” Survey. 550 people (and me) took the survey, and today I got an e-mail with the news that the 2010 survey results are analysed and where published in the “Future.Of.Open.Source blog” In the following (38 slides) presentation:I would like...

Read more »

Google spreadsheets + google forms + R = Easily collecting and importing data for analysis

March 13, 2010
By

Someone on the R mailing list (link) asked: how can you easily (daily) collect data from many people into a spreadsheet and then analyse it using R. The answer people gave to it where on various ways of using excel.  But excel files (at least for now),  are not “on the cloud”.  A better answer might be to create a...

Read more »

A nice link: “Some hints for the R beginner”

March 7, 2010
By

Patrick Burns just posted to the mailing list the following massage: There is now a document called “Some hints for the R beginner” whose purpose is to get people up and running with R as quickly as possible. Direct access to it is: http://www.burns-stat.com/pages/Tutor/hints_R_begin.html JRR Tolkien wrote a story (sans hobbits) called ‘Leaf by Niggle’ that has always resonated with me. I...

Read more »

Nutritional supplements efficacy score – Graphing plots of current studies results (using R)

February 25, 2010
By
Nutritional supplements efficacy score – Graphing plots of current studies results (using R)

In this post I showcase a nice bar-plot and a balloon-plot listing recommended Nutritional supplements , according to how much evidence exists for thier benefits, scroll down to see it(and click here for the data behind it) * * * * The gorgeous blog “Information Is Beautiful” recently publish an eye candy post showing a “balloon race” image...

Read more »

Siegel-Tukey: a Non-parametric test for equality in variability (R code)

February 22, 2010
By

Daniel Malter just shared on the R mailing list (link to the thread) his code for performing the Siegel-Tukey (Nonparametric) test for equality in variability. Excited about the find, I contacted Daniel asking if I could republish his code here, and he kindly replied “yes”. From here on I copy his note at full. p.s: (The R function can be downloaded from...

Read more »

Post hoc analysis for Friedman’s Test (R code)

February 22, 2010
By
Post hoc analysis for Friedman’s Test  (R code)

My goal in this post is to give an overview of Friedman’s Test and then offer R code to perform post hoc analysis on Friedman’s Test results. (The R function can be downloaded from here) Preface: What is Friedman’s Test Friedman test is a non-parametric randomized block analysis of variance. Which is to say it is a non-parametric version of...

Read more »

For fun: Correlation of US State with the number of clicks on online banners

February 16, 2010
By
For fun: Correlation of US State with the number of clicks on online banners

“Chitika research” published today a fun small dataset (you can download it from here) in a post titled “The Educated are Harder to Advertise To”. In this post I had three goals in mind:Suggesting another plot instead of the one used in the original post. Emphasizing the “Correlation does not imply causation” rule. Inviting other R lovers (as myself) to find fun...

Read more »

R Web Application – “Hello World” using RApache (~7min video tutorial)

February 16, 2010
By

I just noticed a google buzz from Jeroen ooms, with a Youtube video titled “RApache Hello World + POST arguments + catching errors.” In this ~7 min video tutorial, Jeroen shares with us:How to write ”Hello World” in a website using RApache. How to extract arguments from a form submited by the website visitor (and then inserting it into an “rnorm” function...

Read more »