Monthly Archives: August 2010

Meeting in the middle; or fudging model II regression with nls

August 3, 2010
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Meeting in the middle; or fudging model II regression with nls

My colleague Karen needed an equation to predict trunk diameter given tree height, which she hoped to base on measurements of trees in semi-arid Australian woodlands. This is the dark art of allometry and a quick google found a large number of formulae...

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Use Rapache: It Works!

August 3, 2010
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Use Rapache: It Works!

A half hour lecture by Jeffery Horner on RApache.

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Suggestions for R-Chart iPhone App?

August 3, 2010
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Suggestions for R-Chart iPhone App?

Have any ideas for news sources to include in  the new R-Chart iPhone App?  I am hoping to make some revisions and fixes and figured I would get some feedback from anyone who happened download it.  Specifically, I am planning on removing...

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RODM Article on the Oracle Technology Network

August 3, 2010
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RODM Article on the Oracle Technology Network

A new article over at OTN demonstrates the new RODM package that allows you to control Oracle Data Mining within the database itself using R.  This and the recent announcement over at Revolution Analytics both reveal more solutions for proces...

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Using R and r.mapcalc (GRASS) to Estimate Mean Topographic Curvature

August 3, 2010
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Using R and r.mapcalc (GRASS) to Estimate Mean Topographic Curvature

Recently I was re-reading a paper on predictive soil mapping (Park et al, 2001), and considered testing one of their proposed terrain attributes in GRASS. The attribute, originally described by Blaszczynski (1997), is the distance-weighted mean differe...

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countrycode R package

August 3, 2010
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I am digging this countrycode package in R I just found, written by a UM grad student Vincent Arel-Bundock. Very nice. Thanks! countrycode("2","cown","iso3c") "USA" It would be better if the package could handle failed matches a little more gracefully: e.g., > countrycode(c(2,730,818),"cown","iso3c") "USA" when the user was expecting to get back a vector

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Image Data and Classification with R

August 3, 2010
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03.08.2010 In this post i would like to demonstrate the ability of R to handle and classify image data with the help of ImageJ and Rserve bundled and implemented in Bio7. In general R is a very useful application for image analysis and plenty of “pure” R packages for image analysis are already available. But

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Announcing Big Data for Revolution R

August 3, 2010
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I've hinted this was coming a few times before, but with today's press release the announcement is official: the next release of Revolution R Enterprise will include "Big Data" capabilities thanks to the new RevoScaleR package. We're pretty excited at how it's turned out: it's kinda amazing to be able to use R's formula syntax like this: arrDelayLm2 <-...

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Quantitative Candlestick Pattern Recognition (Part 2 — What’s this Natural Language Processing stuff?)

August 3, 2010
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Quantitative Candlestick Pattern Recognition (Part 2 — What’s this Natural Language Processing stuff?)

I wanted to briefly add one more thought regarding the temporal nature of probabilities as was alluded to in my correspondence with Adam, as well as the prior closing comments on the Chaos post (structure coalescing and dispersing).I will borrow from t...

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JSM 2010 [day 2]

August 3, 2010
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JSM 2010 [day 2]

After a very good early run in Stanley Park, I went to a morning session on new statistical challenges in genetics, but unfortunately could not keep focussed enough (due to a very short night, still being not tuned to Pacific time!) so I ended up chatting with Sid Chib at the Springer booth about the

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