Monthly Archives: July 2009

useR 2009 in Rennes: Recap and slides

July 12, 2009
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I spent most of last week in Rennes, the capital of Brittany in France, as it was time for UseR! 2009, the annual R conference. Francois Husson, Aline Legrand and others at the Agrocampus Ouest had put together a really well-run conference, and it w...

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Causal inference and biostatistics

July 11, 2009
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I've been following the discussion on causal inference over at Gelman's blog with quite a bit of interest. Of course, this is in response to Judea Pearl's latest book on causal inference, which differs quite a bit from the theory that had been forwarde...

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The Knapsack Problem

July 10, 2009
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The Knapsack Problem

David posts a question about how to solve this knapsack problem using the R statistical computing and analysis platform. My reply in the comments seems to have disappeared for a while so here is my proposed solution:

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The Knapsack Problem

July 10, 2009
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The Knapsack Problem

David posts a question about how to solve this knapsack problem using the R statistical computing and analysis platform. My reply in the comments seems to have disappeared for a while so here is my proposed solution:

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Sometimes, you just need to use a plyr

July 10, 2009
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Sometimes, you just need to use a plyr

I haven’t posted anything about R-nerdery in quite some time. But I have to pause for a moment, and sing the praises of a relatively new package that has made my life exponentially easier. The plyr package. R has the capability to apply a single function to a vector or list using apply or mapply,

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Presenting influence.ME at useR!

July 10, 2009
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Presenting influence.ME at useR!

Today I presented influence.ME at the useR! conference in Rennes. Influence.ME is an R package for detecting influential data in mixed models. I developed this package together with Ben Pelzer and Manfred te Grotenhuis. More information about influence.ME can be ...

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Useful Links

July 9, 2009
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Useful Links

Statistic on WikiPediaR homepageR download (first select the mirror)Blogs on R:Revolutions R BlogR bloggersPlanet RQuick-ROne R tip a dayData Mining With Rattle and RAniWikiR Graph GalleryR Tips / StatsRusRomain Francois blog"R" you ready?Learning RTai...

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Computing Statistics from Poorly Formatted Data (plyr and reshape packages for R)

July 9, 2009
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  Premise I was recently asked to verify the coefficients of a linear model fit to sets of data, where each row of the input file was a "site" and each column contained the dependent variable through time (i.e. column 1 = time step 1, column 2 = time step 2, etc.). This format is cumbersome in that it...

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useR! slides

July 8, 2009
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I've pushed my slides from the presentation I've given at useR! a few minutes ago here

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RGG# 154: demo of atomic functions

July 7, 2009
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RGG# 154: demo of atomic functions

Przemyslaw Biecek has submitted this graph (and also others I will add later) to the graphics galleryA list of examples for the atomic functions polygon(), segments(), symbols(), arrows(), curve(), abline(), points(), lines(). this figure is t...

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