June 2012

Plotting non-overlapping circles…

June 22, 2012 | Luca Fenu

It's holiday today in Sweden, so happy Midsummer to everyone!!! (I know, it's delayed)No work for me, so I checked up the latest XKCD:Gorgeous, right? So I decided to see if I could make something similar - but being lazy, I didn't feel like drawing al... [Read more...]

Analytics with SAP and R (Windows version)

June 22, 2012 | Alvaro "Blag" Tejada Galindo

My good friend and programming guru Piers Harding wrote a blog called Analytics with SAP and R where he showed us how to link the wonderful worlds of R and SAP. Yes...SAP...not SAP HANA...but the good old NetWeaver...Piers build the RSAP extension usin... [Read more...]

When the going gets tough…

June 22, 2012 | Gianluca Baio

Getting closer to my personal Euro2012 derby: England v Italy. I find amusing that both sets of media think that their respective team have been gifted a good tie. The English are very happy to have avoided Spain, while the Italians don't mind not... [Read more...]

eoda publishes interactiveGGPLOT – interactive graphics with ggplot2

June 22, 2012 | Lennart Riecken

One of Rs great strengths compared to other statistic solutions or programming languages is the amount of possibilities for creating well-designed publication-quality plots. Almost all plot types can be created with any amount of fine tuning. R works on small data sets as well as on big data. In addition ... [Read more...]

Two new, important books on R

June 22, 2012 | Pat

Two books were recently published that are sure to help R grow even faster. R has a reputation, partially deserved, for being hard to learn. These books will help. The first makes learning easier, the second can make learning less necessary for initiates. I have not yet touched either book. ... [Read more...]

Video: Getting staRted with R: An accelerated primer by Lyndon Walker – Melbourne R Users

June 22, 2012 | jeromyanglim

This post shares the video from a talk presented on June 20 2012 by Dr Lyndon Walker (see Meetup page). The talk was titled “Getting staRted with R: An accelerated primer”. To quote the outline of the talk : R … Continue reading →

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Nonlinear systems

June 21, 2012 | quantsignals

There is a long standing debate if financial systems are truly random or contain some structure. From the study of non-linear dynamical systems and chaos one finds it is possible that even perfectly deterministic systems can appear to be random. … Continue reading → [Read more...]

Learning a new language

June 21, 2012 | Karl Broman

It had been a very long time since I’d tried to learn a new programming language. I started C in 1987, S in 1992, and Perl in 1997, but nothing really new in the subsequent 15 years. A friend now has me doing D, wanting to find time to learn ruby, and, most ... [Read more...]

Background to my book project “Empirical Software Engineering with R”

June 21, 2012 | Derek-Jones

This post provides background information that can be referenced by future posts. For the last 18 months I have been working in fits and starts on a book that has the working title “Empirical Software Engineering with R”. The idea is to provide broad coverage of software engineering issues from an ... [Read more...]

Confidence intervals with tiers: functions for between-subjects (independent measures) ANOVA

June 21, 2012 | Thom

In a previous post I showed how to plot difference-adjusted CIs for between-subjects (independent measures) ANOVA designs (see here). The rationale behind this kind of graphical display is introduced in Chapter 3 of Serious stats (and summarized in my earlier blog post). In a between-subjects – or in indeed in a within-subjects (... [Read more...]

My first "ChemoSpec" spectra

June 21, 2012 | jrcuesta

I’ve been this week trying to import some spectra to ChemoSpec (R Package), at the beginning I had problems generating the “csv” files, and the function getManyCsv did not recognize the files. I did not have properly configured the regional...

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Plotting differentially methylated bases on an ideogram

June 21, 2012 | altuna

[This article was first published on Recipes, scripts and genomics, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here) Want to [Read more...]

R and the web (for beginners), Part I: How is the local nuclear plant doing?

June 21, 2012 | GivenTheData

One of the things I especially like about R is its ability to easily access and process data from the web. If you are new to R, or never have used it to access data from the Internet, here is the first part of a little series of posts with ... [Read more...]

An example on sentiment analysis with R

June 21, 2012 | Yanchang Zhao

by Yanchang Zhao, RDataMining.com There is a nice example on sentiment analysis with R at . In the example, the Wikileaks cable corpus is analyzed to track US sentiments of other countries and their presidents over time. The example describes … Continue reading → [Read more...]

FDA: R OK for drug trials

June 21, 2012 | David Smith

In a poster (PDF) presented at the UseR 2012 conference, FDA biostatistician Jae Brodsky reiterated the FDA policy regarding software used to prepare submissions for drug approvals with clinical trials: Sponsors may use R in their submissions. The FDA does not endorse or require any particular software to be used for ... [Read more...]

Normalising data within groups

June 21, 2012 | aghaynes

Occasionally it proves useful to normalise data. By this I mean to scale it between zero and one. Admittedly, most people frown of this but there are papers out there with this method in use*. How do we go about this? Its a very simple formula to calculate: y'[i] = ... [Read more...]

The stimuli-as-fixed-effect fallacy

June 21, 2012 | Thom Baguley

Neuroskeptic has just blogged on a new paper by Judd, Westfall and Kenny on Treating stimuli as a random factor in social psychology: A new and comprehensive solution to a pervasive but largely ignored problem. I can't access the original pap... [Read more...]

Solving Big Problems with Oracle R Enterprise, Part I

June 21, 2012 | dbayard

Abstract: This blog post will show how we used Oracle R Enterprise to tackle a customer’s big calculation problem across a big data set. Overview: Databases are great for managing large amounts of data in a central place with rigorous enterprise-level controls. R is great for doing advanced computations. ...

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Experimental Design: Problem Set

June 21, 2012 | Al-Ahmadgaid Asaad

QUESTIONSThe tensile strength of Portland cement is being studied. Four different mixing techniques can be used economically. The following data have been collected: MixingTechniques Tensile Strength (lb/in2) 1 3129 3000 2865 2890 2 3200 3300 2975 3150 3 2800 2900 3985 3050 4 2600 2700 2600 2765 Test the hypothesis that mixing techniques affect the strength of the cement. Use $\alpha=0.05$.Construct a graphical display as described in Section 3...

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The Great Julia RNG Refactor

June 21, 2012 | John Myles White

Many readers of this blog will know that I’m a big fan of Bayesian methods, in large part because automated inference tools like JAGS allow modelers to focus on the types of structure they want to extract from data rather than worry about the algorithmic details of how they ... [Read more...]

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June 2012

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