July 2010

R and Oracle HR Part I – Set Up and Connect

July 8, 2010 | C

There has been recent interest in the attention that Oracle has been giving to R.  This has been related to the use of Oracle Data Mining which is a paid option to Oracle.  This is the first in a series of posts that can be run using the Orac...
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Subsampling for dummies

July 8, 2010 | Timothée

A little piece of code dealing with the subsampling of matrices, in R. Useful if you want to use something akin to bootstrap, or just check the size of your sample with regard to various statistics. [Read more...]

R/Finance 2010 presentations

July 7, 2010 | David Smith

The presentations from April's successful R/Finance 2010 conference in Chicago are now available online. (Revolution Analytics is a proud sponsor of the conference.) There's some amazing content here for anyone looking for the cutting-edge of financial engineering, with presentations from practitioners and researchers at institutions like Invesco Asset Management, Black ... [Read more...]

Navigate the Bermuda Triangle of Mediation Analysis

July 6, 2010 | dan

MYTHS AND TRUTHS ABOUT AN OFTEN-USED, LITTLE-UNDERSTOOD STATISTICAL PROCEDURE If you go to a consumer research conference, you will hear tales of how experiments have undergone particular statistical rites: the attainment of the elusive crossover interaction, the demonstration of full mediation through Baron and Kenny’s sacred procedure, and so ...
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Drawing a trophic network (part 2)

July 6, 2010 | Timothée

Following discussion on the comments of the previous post, I thought about how it was possible to draw links going in several directions (i.e. there are no ‘clear’ differences between the levels, and species from level n can interact with species of level n, n+1, n-1, n±k, etc). ... [Read more...]

Core in CiRM [1]

July 6, 2010 | xi'an

Jean-Michel Marin and myself have thus started our “research in pair” in CIRM, Luminy, for a fortnight. We are working on the second edition of Bayesian Core and, despite working round the clock on the project (except for a one hour run around Mont Puget this morning), we are not ...
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Draw a trophic network with n levels

July 6, 2010 | Timothée

I published a short function to draw trophic networks with several levels, with links going from level n+1 to level n only. It will only be of interest for people working in ecology (but if you see another possible use, please let me know). It is available here – with examples. ... [Read more...]

Chaos in the Financial Markets?

July 6, 2010 | Intelligent Trading

Over the years I've had quite a few interested individuals ask me about Chaos and its applications towards trading. Well, as hidden markov models and speech processing were made popular by James Simons and his team at Renaissance Technologies, one cou...
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Ross Ihaka in Sunday Star Times

July 6, 2010 | David Smith

New Zealand's Sunday Star Times last weekend featured a profile on Ross Ihaka, co-creator of R: The down-to-earth associate statistics professor and his fellow researcher Robert Gentleman are famous around the world for developing R programming – a "glorified calculator" that crunches data. R programming allows for statistical computing and graphics ... [Read more...]

New versions of plyr, ggplot2 released

July 6, 2010 | David Smith

Hadley Wickham has announced that new versions of his popular grammar-of-graphics charting package ggplot2 and his general-purpose data reshaping tool plyr for R are now available. plyr boasts several new features, most notably a new join function which should simplify what can sometimes be a difficult process in R: merging ... [Read more...]

Example 8.1: Digits of Pi

July 6, 2010 | Ken Kleinman

Do the digits of Pi appear in a random order? If so, the trillions of digits of Pi calculated can serve as a useful random number generator. This post was inspired by this entry on Matt Asher's blog. Generating pseudo-random numbers is a key piece o...
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R goes to StackExchange

July 6, 2010 | Ben Mazzotta

“What’s the big deal? We already have the r-help mailing list.” No, it’s a big deal. Really. Have you forgotten the joys of being a first-year R user, either begging advice off of friends or using Google to search archives of the R-help list? (Firefox has a dedicated ... [Read more...]

oro.nifti 0.2.0

July 6, 2010 | Brandon Whitcher

The latest version of oro.nifti (0.2.0) has been released on CRAN.  New features include:Reduced overall size of the package by an additional 50% This is a 75% reduction in total from version 0.1.4Four-dimensional acquisitions are now re-orient... [Read more...]

Go Guerrill… R on Your Data in August

July 5, 2010 | Neil Gunther

Only one month to go! Register now for the Guerrilla Data Analysis Techniques (GDAT) class to be held during the week of August 9-13, 2010. The focus will be on using R and the PDQ-R for computer performance analysis and capacity planning.(Click on t... [Read more...]

Prime Parallels for Load Balancing

July 5, 2010 | Neil Gunther

Having finally popped the stack on computing prime numbers with R in Part II and Part III, we are now in a position to discuss their relevance for computational scalability.My original intent was to show how poor partitioning of a workload can defeat the linear scalability expected when full ... [Read more...]

Hacker News Religion Poll

July 5, 2010 | C

Hacker News user post polls from time to time - the following code constructs a bar chart based upon the responses to a recent poll on the stated religious affiliation of Hacker news users (parsed straight from the site).  The chart above is as of...
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