Monthly Archives: July 2010

R and Oracle HR Part I – Set Up and Connect

July 8, 2010
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R and Oracle HR Part I – Set Up and Connect

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
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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.

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R/Finance 2010 presentations

July 7, 2010
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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 Mesa Capital, and some of the leading academic institutions...

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All code on GGD is Free (Open Source BSD)

July 7, 2010
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At the request of a commenter I just wanted to clarify that any code released here for R or anything else is free and open source unless specifically stated otherwise. The open source BSD license for any code on GGD can be found on this copyright page.

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Navigate the Bermuda Triangle of Mediation Analysis

July 6, 2010
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Navigate the Bermuda Triangle of Mediation Analysis

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 on. DSN has nothing against any

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Drawing a trophic network (part 2)

July 6, 2010
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Drawing a trophic network (part 2)

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). This is now done, with a code

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Core in CiRM [1]

July 6, 2010
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Core in CiRM [1]

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 going as fast as planned…

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Draw a trophic network with n levels

July 6, 2010
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Draw a trophic network with n levels

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. If I continue to

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Chaos in the Financial Markets?

July 6, 2010
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Chaos in the Financial Markets?

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
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Ross Ihaka in Sunday Star Times

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 and is used by thousands of companies worldwide...

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